UN Offensive, 1950
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The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the
Korean Peninsula Korea is a peninsular region in East Asia consisting of the Korean Peninsula, Jeju Island, and smaller islands. Since the end of World War II in 1945, it has been politically divided at or near the 38th parallel between North Korea (Dem ...
fought between
North Korea North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korea, Korean Peninsula and borders China and Russia to the north at the Yalu River, Yalu (Amnok) an ...
(Democratic People's Republic of Korea; DPRK) and
South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...
(Republic of Korea; ROK) and their allies. North Korea was supported by
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
and the
Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
, while South Korea was supported by the
United Nations Command United Nations Command (UNC or UN Command) is the multinational military force established to support the South Korea, Republic of Korea (South Korea) during and after the Korean War. It was the first attempt at collective security by the U ...
(UNC) led by the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
. The conflict was one of the first major
proxy war In political science, a proxy war is an armed conflict where at least one of the belligerents is directed or supported by an external third-party power. In the term ''proxy war'', a belligerent with external support is the ''proxy''; both bel ...
s of the
Cold War The Cold War was a period of global Geopolitics, geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc, which lasted from 1947 unt ...
. Fighting ended in 1953 with an
armistice An armistice is a formal agreement of warring parties to stop fighting. It is not necessarily the end of a war, as it may constitute only a cessation of hostilities while an attempt is made to negotiate a lasting peace. It is derived from t ...
but no
peace treaty A peace treaty is an treaty, agreement between two or more hostile parties, usually country, countries or governments, which formally ends a declaration of war, state of war between the parties. It is different from an armistice, which is an ag ...
, leading to the ongoing
Korean conflict The Korean conflict is an List of ongoing armed conflicts, ongoing conflict based on the division of Korea between North Korea (Democratic People's Republic of Korea) and South Korea (Republic of Korea), both of which claim to be the sole Legit ...
. After the end of
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
in 1945, Korea, which had been a Japanese colony for 35 years, was divided by the
Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
and the United States into two occupation zones at the 38th parallel, with plans for a future independent state. Due to political disagreements and influence from their backers, the zones formed their governments in 1948. North Korea was led by
Kim Il Sung Kim Il Sung (born Kim Song Ju; 15 April 1912 – 8 July 1994) was a North Korean politician and the founder of North Korea, which he led as its first Supreme Leader (North Korean title), supreme leader from North Korea#Founding, its establishm ...
in
Pyongyang Pyongyang () is the Capital city, capital and largest city of North Korea, where it is sometimes labeled as the "Capital of the Revolution" (). Pyongyang is located on the Taedong River about upstream from its mouth on the Yellow Sea. Accordi ...
, and South Korea by
Syngman Rhee Syngman Rhee (; 26 March 1875 – 19 July 1965), also known by his art name Unam (), was a South Korean politician who served as the first president of South Korea from 1948 to 1960. Rhee was also the first and last president of the Provisiona ...
in
Seoul Seoul, officially Seoul Special Metropolitan City, is the capital city, capital and largest city of South Korea. The broader Seoul Metropolitan Area, encompassing Seoul, Gyeonggi Province and Incheon, emerged as the world's List of cities b ...
; both claimed to be the sole legitimate government of all of Korea and engaged in border clashes as internal unrest was fomented by communist groups in the south. On 25 June 1950, the
Korean People's Army The Korean People's Army (KPA; ) encompasses the combined military forces of North Korea and the armed wing of the Workers' Party of Korea (WPK). The KPA consists of five branches: the Korean People's Army Ground Force, Ground Force, the Ko ...
(KPA), equipped and trained by the Soviets, launched an invasion of the south. In the absence of the Soviet Union's representative, the
UN Security Council The United Nations Security Council (UNSC) is one of the six principal organs of the United Nations (UN) and is charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, an ...
denounced the attack and recommended member states to repel the invasion. UN forces comprised 21 countries, with the United States providing around 90% of military personnel. Seoul was captured by the KPA on 28 June, and by early August, the Republic of Korea Army (ROKA) and its allies were nearly defeated, holding onto only the Pusan Perimeter in the peninsula's southeast. On 15 September, UN forces landed at Inchon near Seoul, cutting off KPA troops and supply lines. UN forces broke out from the perimeter on 18 September, re-captured Seoul, and invaded North Korea in October, capturing Pyongyang and advancing towards the Yalu River—the border with China. On 19 October, the Chinese
People's Volunteer Army The People's Volunteer Army (PVA), officially the Chinese People's Volunteers (CPV), was the armed expeditionary forces China in the Korean War, deployed by the History of the People's Republic of China (1949–1976), People's Republic of Chi ...
(PVA) crossed the Yalu and entered the war on the side of the North. UN forces retreated from North Korea in December, following the PVA's first and second offensive. Communist forces captured Seoul again in January 1951 before losing it to a UN counter-offensive two months later. After an abortive Chinese spring offensive, UN forces retook territory roughly up to the 38th parallel. Armistice negotiations began in July 1951, but dragged on as the fighting became a war of attrition and the North suffered heavy damage from U.S. bombing. Combat ended on 27 July 1953 with the signing of the
Korean Armistice Agreement The Korean Armistice Agreement (; zh, t=韓國停戰協定 / 朝鮮停戰協定) is an armistice that brought about a cessation of hostilities of the Korean War. It was signed by United States Army Lieutenant General William Kelly Harrison Jr ...
, which allowed the exchange of prisoners and created a Demilitarized Zone (DMZ) along the frontline, with a Joint Security Area at Panmunjom. The conflict caused more than one million military deaths and an estimated two to three million civilian deaths. Alleged war crimes include the mass killing of suspected communists by Seoul and the mass killing of alleged reactionaries by Pyongyang. North Korea became one of the most heavily bombed countries in history, and virtually all of Korea's major cities were destroyed. No peace treaty has been signed, making the war a frozen conflict.


Names

In South Korea, the war is usually referred to as the "625 War" (), the "625 Upheaval" (), or simply "625", reflecting the date of its commencement on 25 June. In North Korea, the war is officially referred to as the ''Fatherland Liberation War'' () or the '' Chosŏn'' orean''War'' (). In mainland China, the segment of the war after the intervention of the
People's Volunteer Army The People's Volunteer Army (PVA), officially the Chinese People's Volunteers (CPV), was the armed expeditionary forces China in the Korean War, deployed by the History of the People's Republic of China (1949–1976), People's Republic of Chi ...
is commonly and officially known as the "Great Movement to Resist America and Assist Korea" (), although the term "'' Chosŏn'' War" () is sometimes used unofficially. The term "'' Hán'' (Korean) War" () is most used in
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
(Republic of China),
Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor ...
and
Macau Macau or Macao is a special administrative regions of China, special administrative region of the People's Republic of China (PRC). With a population of about people and a land area of , it is the most List of countries and dependencies by p ...
. In the US, the war was initially described by President
Harry S. Truman Harry S. Truman (May 8, 1884December 26, 1972) was the 33rd president of the United States, serving from 1945 to 1953. As the 34th vice president in 1945, he assumed the presidency upon the death of Franklin D. Roosevelt that year. Subsequen ...
as a " police action" as the US never formally declared war and the operation was conducted under the auspices of the UN. It has sometimes been referred to in the
English-speaking world The English-speaking world comprises the 88 countries and territories in which English language, English is an official, administrative, or cultural language. In the early 2000s, between one and two billion people spoke English, making it the ...
as "The Forgotten War" or "The Unknown War" because of the lack of public attention it received relative to World War II and the
Vietnam War The Vietnam War (1 November 1955 – 30 April 1975) was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam (Democratic Republic of Vietnam) and South Vietnam (Republic of Vietnam) and their allies. North Vietnam w ...
.


Background


Imperial Japanese rule (1910–1945)

The
Empire of Japan The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From Japan–Kor ...
diminished the influence of
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
over Korea in the
First Sino-Japanese War The First Sino-Japanese War (25 July 189417 April 1895), or the First China–Japan War, was a conflict between the Qing dynasty of China and the Empire of Japan primarily over influence in Joseon, Korea. In Chinese it is commonly known as th ...
(1894–95). A decade later, after defeating
Imperial Russia Imperial is that which relates to an empire, emperor/empress, or imperialism. Imperial or The Imperial may also refer to: Places United States * Imperial, California * Imperial, Missouri * Imperial, Nebraska * Imperial, Pennsylvania * ...
in the
Russo-Japanese War The Russo-Japanese War (8 February 1904 – 5 September 1905) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and the Korean Empire. The major land battles of the war were fought on the ...
, Japan made the Korean Empire its
protectorate A protectorate, in the context of international relations, is a State (polity), state that is under protection by another state for defence against aggression and other violations of law. It is a dependent territory that enjoys autonomy over ...
with the Eulsa Treaty in 1905, then annexed it with the Japan–Korea Treaty of 1910. Many Korean nationalists fled the country. The
Provisional Government of the Republic of Korea The Korean Provisional Government (KPG), formally the Provisional Government of the Republic of Korea (), was a Korean government-in-exile based in Republic of China (1912–1949), China during Korea under Japanese rule, Japanese rule over K ...
was founded in 1919 in Nationalist China. It failed to achieve international recognition, failed to unite the nationalist groups, and had a fractious relationship with its US-based founding president,
Syngman Rhee Syngman Rhee (; 26 March 1875 – 19 July 1965), also known by his art name Unam (), was a South Korean politician who served as the first president of South Korea from 1948 to 1960. Rhee was also the first and last president of the Provisiona ...
. In China, the nationalist
National Revolutionary Army The National Revolutionary Army (NRA; zh, labels=no, t=國民革命軍) served as the military arm of the Kuomintang, Chinese Nationalist Party (Kuomintang, or KMT) from 1924 until 1947. From 1928, it functioned as the regular army, de facto ...
and the communist
People's Liberation Army The People's Liberation Army (PLA) is the military of the Chinese Communist Party (CCP) and the People's Republic of China (PRC). It consists of four Military branch, services—People's Liberation Army Ground Force, Ground Force, People's ...
(PLA) helped organize Korean refugees against the Japanese military, which had also occupied parts of China. The Nationalist-backed Koreans, led by Yi Pom-Sok, fought in the
Burma campaign The Burma campaign was a series of battles fought in the British colony of British rule in Burma, Burma as part of the South-East Asian theatre of World War II. It primarily involved forces of the Allies of World War II, Allies (mainly from ...
(1941–45). The communists, led by, among others,
Kim Il Sung Kim Il Sung (born Kim Song Ju; 15 April 1912 – 8 July 1994) was a North Korean politician and the founder of North Korea, which he led as its first Supreme Leader (North Korean title), supreme leader from North Korea#Founding, its establishm ...
, fought the Japanese in Korea and
Manchuria Manchuria is a historical region in northeast Asia encompassing the entirety of present-day northeast China and parts of the modern-day Russian Far East south of the Uda (Khabarovsk Krai), Uda River and the Tukuringra-Dzhagdy Ranges. The exact ...
. At the
Cairo Conference Cairo ( ; , ) is the Capital city, capital and largest city of Egypt and the Cairo Governorate, being home to more than 10 million people. It is also part of the List of urban agglomerations in Africa, largest urban agglomeration in Africa, L ...
in 1943, China, the UK, and the US decided that "in due course, Korea shall become free and independent".


Korea divided (1945–1949)

At the Tehran Conference in 1943 and the Yalta Conference in February 1945, the Soviet Union promised to join its allies in the
Pacific War The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
within three months of the victory in Europe. The USSR declared war on Japan and invaded Manchuria on 8 August 1945. On 10 August, Soviet forces entered northern Korea and secured most major cities in the north by 24 August. Japanese resistance was light. Having fought Japan on Korean soil, the Soviet forces were well-received by Koreans. On 10 August in Washington, US Colonels Dean Rusk and Charles H. Bonesteel III were assigned to divide Korea into Soviet and US occupation zones and proposed the 38th parallel as the dividing line. This was incorporated into the US General Order No. 1, which responded to the Japanese surrender on 15 August. Explaining the choice of the 38th parallel, Rusk observed, "Even though it was further north than could be realistically reached by U. S. 'sic''forces in the event of Soviet disagreement ... we felt it important to include the capital of Korea in the area of responsibility of American troops".
Joseph Stalin Joseph Vissarionovich Stalin (born Dzhugashvili; 5 March 1953) was a Soviet politician and revolutionary who led the Soviet Union from 1924 until Death and state funeral of Joseph Stalin, his death in 1953. He held power as General Secret ...
, however, maintained his wartime policy of cooperation, and on 16 August, the Red Army halted at the 38th parallel for three weeks to await the arrival of US forces. On 7 September 1945, General
Douglas MacArthur Douglas MacArthur (26 January 18805 April 1964) was an American general who served as a top commander during World War II and the Korean War, achieving the rank of General of the Army (United States), General of the Army. He served with dis ...
issued Proclamation No. 1 to the people of Korea, announcing US military control over Korea south of the 38th parallel and establishing English as the official language during military control. On 8 September, US Lieutenant General
John R. Hodge General John Reed Hodge (12 June 1893 – 12 November 1963) was an American military officer of the United States Army. Hodge commanded Operation Blacklist Forty in 1945. He served as the governor of the American military government in Korea fr ...
arrived in
Incheon Incheon is a city located in northwestern South Korea, bordering Seoul and Gyeonggi Province to the east. Inhabited since the Neolithic, Incheon was home to just 4,700 people when it became an international port in 1883. As of February 2020, ...
to accept the Japanese surrender south of the 38th parallel. Appointed as military governor, Hodge directly controlled South Korea as head of the
United States Army Military Government in Korea The United States Army Military Government in Korea (USAMGIK) was the official ruling body of the southern half of the Korea, Korean Peninsula from 9 September 1945 to 15 August 1948. The country during this period was plagued with political a ...
(USAMGIK 1945–48). In December 1945, Korea was administered by the US–Soviet Union Joint Commission, as agreed at the Moscow Conference, to grant independence after a five-year trusteeship. Waiting five years for independence was unpopular among Koreans, and riots broke out. The Communist Party supported the trusteeship, while Kim Ku and
Syngman Rhee Syngman Rhee (; 26 March 1875 – 19 July 1965), also known by his art name Unam (), was a South Korean politician who served as the first president of South Korea from 1948 to 1960. Rhee was also the first and last president of the Provisiona ...
led the anti-trusteeship movement against both the U.S. military government and the Soviet military administration. To contain them, the USAMGIK banned strikes on 8 December and outlawed the PRK Revolutionary Government and People's Committees on 12 December. Following further civilian unrest, the USAMGIK declared
martial law Martial law is the replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. Martial law can continue for a specified amount of time, or indefinitely, and standard civil liberties ...
. Citing the inability of the Joint Commission to make progress, the UN decided to hold an election under UN auspices to create an independent Korea, as stated in UN General Assembly Resolution 112. The Soviet authorities and Korean communists refused to participate in the election. The final attempt to establish a unified government was thwarted by North Korea's refusal. Due to concerns about division caused by an election without North Korea's participation, many South Korean politicians boycotted it. The 1948 South Korean general election was held in May. The resultant South Korean government promulgated a national political constitution on 17 July and elected Syngman Rhee as president on 20 July. The Republic of Korea (South Korea) was established on 15 August 1948. In the Soviet-Korean Zone of Occupation, the Soviets agreed to the establishment of a communist government led by Kim Il Sung. The 1948 North Korean parliamentary elections took place in August. The Soviet Union withdrew its forces in 1948 and the US in 1949.


Chinese Civil War (1945–1949)

With the end of the war with Japan, the
Chinese Civil War The Chinese Civil War was fought between the Kuomintang-led Nationalist government, government of the Republic of China (1912–1949), Republic of China and the forces of the Chinese Communist Party (CCP). Armed conflict continued intermitt ...
resumed in earnest between the
Communists Communism () is a sociopolitical, philosophical, and economic ideology within the socialist movement, whose goal is the creation of a communist society, a socioeconomic order centered on common ownership of the means of production, d ...
and the
Nationalist Nationalism is an idea or movement that holds that the nation should be congruent with the State (polity), state. As a movement, it presupposes the existence and tends to promote the interests of a particular nation,Anthony D. Smith, Smith, A ...
-led government. While the Communists were struggling for supremacy in Manchuria, they were supported by the North Korean government with matériel and manpower. According to Chinese sources, the North Koreans donated 2,000 railway cars worth of supplies while thousands of Koreans served in the Chinese PLA during the war. North Korea also provided the Chinese Communists in
Manchuria Manchuria is a historical region in northeast Asia encompassing the entirety of present-day northeast China and parts of the modern-day Russian Far East south of the Uda (Khabarovsk Krai), Uda River and the Tukuringra-Dzhagdy Ranges. The exact ...
with a safe refuge for non-combatants and communications with the rest of China. As a token of gratitude, between 50,000 and 70,000 Korean veterans who served in the PLA were sent back along with their weapons, and they later played a significant role in the initial invasion of South Korea. China promised to support the North Koreans in the event of a war against South Korea.


Communist insurgency in South Korea (1948–1950)

By 1948, a North Korea-backed insurgency had broken out in the southern half of the peninsula. This was exacerbated by the undeclared border war between the Koreas, which saw division-level engagements and thousands of deaths on both sides. The ROK was almost entirely trained and focused on counterinsurgency, rather than conventional warfare. They were equipped and advised by a force of a few hundred American officers, who were successful in helping the ROKA to subdue guerrillas and hold its own against North Korean military (Korean People's Army, KPA) forces along the 38th parallel.Bryan, p. 76. Approximately 8,000 South Korean soldiers and police officers died in the insurgent war and border clashes. The first socialist uprising occurred without direct North Korean participation, though the guerrillas still professed support for the northern government. Beginning in April 1948 on
Jeju Island Jeju Island (Jeju language, Jeju/) is South Korea's largest island, covering an area of , which is 1.83% of the total area of the country. Alongside outlying islands, it is part of Jeju Province and makes up the majority of the province. The i ...
, the campaign saw arrests and repression by the South Korean government in the fight against the South Korean Labor Party, resulting in 30,000 violent deaths, among them 14,373 civilians, of whom ~2,000 were killed by rebels and ~12,000 by ROK security forces. The Yeosu–Suncheon rebellion overlapped with it, as several thousand army defectors waving red flags massacred right-leaning families. This resulted in another brutal suppression by the government and between 2,976 and 3,392 deaths. By May 1948, both uprisings had been crushed. Insurgency reignited in the spring of 1949 when attacks by guerrillas in the mountainous regions (buttressed by army defectors and North Korean agents) increased. Insurgent activity peaked in late 1949 as the ROKA engaged so-called People's Guerrilla Units. Organized and armed by the North Korean government, and backed by 2,400 KPA commandos who had infiltrated through the border, these guerrillas launched an offensive in September aimed at undermining the South Korean government and preparing the country for the KPA's arrival in force. This offensive failed. However, the guerrillas were now entrenched in the Taebaek-san region of the
North Gyeongsang Province North Gyeongsang Province (, ) is a province in eastern South Korea, and with an area of , it is the largest province in the Korean peninsula. The province was formed in 1896 from the northern half of the former Gyeongsang province, and remaine ...
and the border areas of the Gangwon Province.Bryan, p. 78. While the insurgency was ongoing, the ROKA and KPA engaged in battalion-sized battles along the border, starting in May 1949. Border clashes between South and North continued on 4 August 1949, when thousands of North Korean troops attacked South Korean troops occupying territory north of the 38th parallel. The 2nd and 18th ROK Infantry Regiments repulsed attacks in Kuksa-bong, and KPA troops were "completely routed". Border incidents decreased by the start of 1950. Meanwhile, counterinsurgencies in the South Korean interior intensified; persistent operations, paired with worsening weather, denied the guerrillas sanctuary and wore away their fighting strength. North Korea responded by sending more troops to link up with insurgents and build more partisan cadres; North Korean infiltrators had reached 3,000 soldiers in 12 units by the start of 1950, but all were destroyed or scattered by the ROKA. On 1 October 1949, the ROKA launched a three-pronged assault on the insurgents in South Cholla and
Taegu Daegu (; ), formerly spelled Taegu and officially Daegu Metropolitan City (), is a city in southeastern South Korea. It is the third-largest urban agglomeration in South Korea after Seoul and Busan; the fourth-largest List of provincial-level ci ...
. By March 1950, the ROKA claimed 5,621 guerrillas killed or captured and 1,066 small arms seized. This operation crippled the insurgency. Soon after, North Korea made final attempts to keep the uprising active, sending battalion-sized units of infiltrators under the commands of Kim Sang-ho and Kim Moo-hyon. The first battalion was reduced to a single man over the course of engagements by the ROKA 8th Division. The second was annihilated by a two-battalion hammer-and-anvil maneuver by units of the ROKA 6th Division, resulting in a toll of 584 KPA guerrillas (480 killed, 104 captured) and 69 ROKA troops killed, plus 184 wounded. By the spring of 1950, guerrilla activity had mostly subsided; the border, too, was calm.


Prelude to war (1950)

By 1949, South Korean and US military actions had reduced indigenous communist guerrillas in the South from 5,000 to 1,000. However, Kim Il Sung believed widespread uprisings had weakened the South Korean military and that a North Korean invasion would be welcomed by much of the South Korean population. Kim began seeking Stalin's support for an invasion in March 1949, traveling to Moscow to persuade him. Stalin initially did not think the time was right for a war in Korea. PLA forces were still embroiled in the Chinese Civil War, while US forces remained stationed in South Korea. By spring 1950, he believed that the strategic situation had changed: PLA forces under
Mao Zedong Mao Zedong pronounced ; traditionally Romanization of Chinese, romanised as Mao Tse-tung. (26December 18939September 1976) was a Chinese politician, revolutionary, and political theorist who founded the People's Republic of China (PRC) in ...
had secured final victory, US forces had withdrawn from Korea, and the Soviets had detonated their first nuclear bomb, breaking the US monopoly. As the US had not directly intervened to stop the communists in China, Stalin calculated they would be even less willing to fight in Korea, which had less strategic significance. The Soviets had cracked the codes used by the US to communicate with their embassy in Moscow, and reading dispatches convinced Stalin that Korea did not have the importance to the US that would warrant a nuclear confrontation. Stalin began a more aggressive strategy in Asia based on these developments, including promising economic and military aid to China through the Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance. In April 1950, Stalin permitted Kim to attack the government in the South, under the condition that Mao would agree to send reinforcements if needed. For Kim, this was the fulfillment of his goal to unite Korea. Stalin made it clear Soviet forces would not openly engage in combat, to avoid a direct war with the United States. Kim met with Mao in May 1950 and differing historical interpretations of the meeting have been put forward. According to Barbara Barnouin and Yu Changgeng, Mao agreed to support Kim despite concerns of American intervention, as China desperately needed the economic and military aid promised by the Soviets. Kathryn Weathersby cites Soviet documents which said Kim secured Mao's support. Along with Mark O'Neill, she says this accelerated Kim's war preparations. Chen Jian argues Mao never seriously challenged Kim's plans and Kim had every reason to inform Stalin that he had obtained Mao's support. Citing more recent scholarship, Zhao Suisheng contends Mao did not approve of Kim's war proposal and requested verification from Stalin, who did so via a telegram. Mao accepted the decision made by Kim and Stalin to unify Korea but cautioned Kim over possible US intervention. Soviet generals with extensive combat experience from World War II were sent to North Korea as the Soviet Advisory Group. They completed plans for attack by May and called for a skirmish to be initiated in the Ongjin Peninsula on the west coast of Korea. The North Koreans would then launch an attack to capture Seoul and encircle and destroy the ROK. The final stage would involve destroying South Korean government remnants and capturing the rest of South Korea, including the ports. On 7 June 1950, Kim called for a Korea-wide election on 5–8 August 1950 and a consultative conference in
Haeju Haeju () is a city located in South Hwanghae Province near Haeju Bay in North Korea. It is the administrative centre of South Hwanghae Province. As of 2008, the population of the city is estimated to be 273,300. At the beginning of the 20th centu ...
on 15–17 June. On 11 June, the North sent three diplomats to the South as a peace overture, which Rhee rejected outright. On 21 June, Kim revised his war plan to involve a general attack across the 38th parallel, rather than a limited operation in Ongjin. Kim was concerned that South Korean agents had learned about the plans and that South Korean forces were strengthening their defenses. Stalin agreed to this change. While these preparations were underway in the North, there were clashes along the 38th parallel, especially at
Kaesong Kaesong (, ; ) is a special city in the southern part of North Korea (formerly in North Hwanghae Province), and the capital of Korea during the Taebong kingdom and subsequent Goryeo dynasty. The city is near the Kaesong Industrial Region cl ...
and Ongjin, many initiated by the South. The ROK was being trained by the US Korean Military Advisory Group (KMAG). On the eve of the war, KMAG commander General William Lynn Roberts voiced utmost confidence in the ROK and boasted that any North Korean invasion would merely provide "target practice". For his part, Syngman Rhee repeatedly expressed his desire to conquer the North, including when US diplomat
John Foster Dulles John Foster Dulles (February 25, 1888 – May 24, 1959) was an American politician, lawyer, and diplomat who served as United States secretary of state under President Dwight D. Eisenhower from 1953 until his resignation in 1959. A member of the ...
visited Korea on 18 June. Though some South Korean and US intelligence officers predicted an attack, similar predictions had been made before and nothing had happened. The
Central Intelligence Agency The Central Intelligence Agency (CIA; ) is a civilian foreign intelligence service of the federal government of the United States tasked with advancing national security through collecting and analyzing intelligence from around the world and ...
noted the southward movement by the KPA but assessed this as a "defensive measure" and concluded an invasion was "unlikely". On 23 June UN observers inspected the border and did not detect that war was imminent.


Comparison of forces

Chinese involvement was extensive from the beginning, building on previous collaboration between the Chinese and Korean communists during the Chinese Civil War. Throughout 1949 and 1950, the Soviets continued arming North Korea. After the communist victory in the Chinese Civil War, ethnic Korean units in the PLA were sent to North Korea. In the fall of 1949, two PLA divisions composed mainly of Korean-Chinese troops (the 164th and 166th) entered North Korea, followed by smaller units throughout the rest of 1949. The reinforcement of the KPA with PLA veterans continued into 1950, with the 156th Division and several other units of the former Fourth Field Army arriving in February; the PLA 156th Division was reorganized as the KPA 7th Division. By mid-1950, between 50,000 and 70,000 former PLA troops had entered North Korea, forming a significant part of the KPA's strength on the eve of the war's beginning. The combat veterans and equipment from China, the tanks, artillery, and aircraft supplied by the Soviets, and rigorous training increased North Korea's military superiority over the South, armed by the U.S. military with mostly small arms, but no heavy weaponry. Several generals, such as Lee Kwon-mu, were PLA veterans born to ethnic Koreans in China. While older histories of the conflict often referred to these ethnic Korean PLA veterans as being sent from northern Korea to fight in the Chinese Civil War before being sent back, recent Chinese archival sources studied by Kim Donggill indicate that this was not the case. Rather, the soldiers were indigenous to China, as part of China's longstanding ethnic Korean community, and were recruited to the PLA in the same way as any other Chinese citizen. According to the first official census in 1949, the population of North Korea numbered 9,620,000, and by mid-1950, North Korean forces numbered between 150,000 and 200,000 troops, organized into 10 infantry divisions, one tank division, and one air force division, with 210 fighter planes and 280 tanks, who captured scheduled objectives and territory, among them Kaesong,
Chuncheon Chuncheon (; ; literally ''spring river''), formerly romanized as Ch'unch'ŏn, is the capital of Gangwon Province, South Korea. The city lies in the north of the country, located in a basin formed by the Soyang River and Han River (Korea), Han R ...
,
Uijeongbu Uijeongbu (; ) is a Administrative divisions of South Korea, city in Gyeonggi Province, South Korea. It is the tenth-most populous city in the province and a suburb of Seoul within the greater Seoul Metropolitan Area. History Uijeongbu was estab ...
, and Ongjin. Their forces included 274 T-34-85 tanks, 200 artillery pieces, 110 attack bombers, 150 Yak fighter planes, and 35 reconnaissance aircraft. In addition to the invasion force, the North had 114 fighters, 78 bombers, 105 T-34-85 tanks, and some 30,000 soldiers stationed in reserve in North Korea. Although each navy consisted of only several small warships, the North and South Korean navies fought in the war as seaborne artillery for their armies. In contrast, the South Korean population was estimated at 20 million, over twice that of the North, but its army was unprepared and ill-equipped. As of 25 June 1950, the ROK had 98,000 soldiers (65,000 combat, 33,000 support), no tanks (they had been requested from the U.S. military, but requests were denied), and a 22-plane air force comprising 12 liaison-type and 10 AT-6 advanced-trainer airplanes. Large U.S. garrisons and air forces were in Japan, but only 200–300 U.S. troops were in Korea.


Course of the war


Operation Pokpung

At dawn on 25 June 1950, the KPA crossed the 38th parallel behind artillery fire. It justified its assault with the claim ROK troops attacked first and that the KPA were aiming to arrest and execute the "bandit traitor Syngman Rhee". Fighting began on the strategic Ongjin Peninsula in the west. There were initial South Korean claims that the 17th Regiment had counterattacked at Haeju; some scholars argue the claimed counterattack was instead the instigating attack, and therefore that the South Koreans may have fired first. However, the report that contained the Haeju claim contained errors and outright falsehoods. KPA forces attacked all along the 38th parallel within an hour. The KPA had a combined arms force including tanks supported by heavy artillery. The ROK had no tanks, anti-tank weapons, or heavy artillery. The South Koreans committed their forces in a piecemeal fashion, and these were routed in a few days. On 27 June, Rhee evacuated Seoul with some of the government. At 02:00 on 28 June the ROK blew up the Hangang Bridge across the Han River in an attempt to stop the KPA. The bridge was detonated while 4,000 refugees were crossing it, and hundreds were killed. Destroying the bridge trapped many ROK units north of the river. In spite of such desperate measures, Seoul fell that same day. Some South Korean National Assemblymen remained in Seoul when it fell, and 48 subsequently pledged allegiance to the North. On 28 June, Rhee ordered the massacre of suspected political opponents in his own country. In five days, the ROK, which had 95,000 troops on 25 June, was down to less than 22,000 troops. In early July, when US forces arrived, what was left of the ROK was placed under US operational command of the
United Nations Command United Nations Command (UNC or UN Command) is the multinational military force established to support the South Korea, Republic of Korea (South Korea) during and after the Korean War. It was the first attempt at collective security by the U ...
.


Factors in U.S. intervention

The Truman administration was unprepared for the invasion. Korea was not included in the strategic Asian Defense Perimeter outlined by
United States Secretary of State The United States secretary of state (SecState) is a member of the executive branch of the federal government of the United States and the head of the U.S. Department of State. The secretary of state serves as the principal advisor to the ...
Dean Acheson Dean Gooderham Acheson ( ; April 11, 1893October 12, 1971) was an American politician and lawyer. As the 51st United States Secretary of State, U.S. Secretary of State, he set the foreign policy of the Harry S. Truman administration from 1949 to ...
. Military strategists were more concerned with the security of Europe against the Soviet Union than that of
East Asia East Asia is a geocultural region of Asia. It includes China, Japan, Mongolia, North Korea, South Korea, and Taiwan, plus two special administrative regions of China, Hong Kong and Macau. The economies of Economy of China, China, Economy of Ja ...
. The administration was worried a war in Korea could quickly escalate without American intervention. Diplomat John Foster Dulles stated: "To sit by while Korea is overrun by unprovoked armed attack would start a disastrous chain of events leading most probably to world war." While there was hesitance by some in the US government to get involved, considerations about Japan fed into the decision to engage on behalf of South Korea. After the fall of China to the communists, US experts saw Japan as the region's counterweight to the Soviet Union and China. While there was no US policy dealing with South Korea directly as a national interest, its proximity to Japan increased its importance. Said Kim: "The recognition that the security of Japan required a non-hostile Korea led directly to President Truman's decision to intervene ... The essential point ... is that the American response to the North Korean attack stemmed from considerations of U.S. policy toward Japan." Another consideration was the Soviet reaction if the US intervened. The Truman administration was fearful the Korean War was a diversionary assault that would escalate to a general war in Europe once the US committed in Korea. At the same time, " ere was no suggestion from anyone that the United Nations or the United States could back away from he conflict.
Yugoslavia , common_name = Yugoslavia , life_span = 1918–19921941–1945: World War II in Yugoslavia#Axis invasion and dismemberment of Yugoslavia, Axis occupation , p1 = Kingdom of SerbiaSerbia , flag_p ...
—a possible Soviet target because of the Tito-Stalin split—was vital to the defense of Italy and Greece, and the country was first on the list of the
National Security Council A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a n ...
's post-North Korea invasion list of "chief danger spots". Truman believed if aggression went unchecked, a chain reaction would start that would marginalize the UN and encourage communist aggression elsewhere. The UN Security Council approved the use of force to help the South Koreans. The Truman administration was uncertain whether the attack was a ploy by the Soviet Union, or just a test of US resolve. The decision to commit ground troops became viable when a communiqué was received on 27 June indicating the Soviet Union would not move against US forces in Korea. The Truman administration believed it could intervene in Korea without undermining its commitments elsewhere.


United Nations Security Council resolutions

On 25 June 1950, the
United Nations Security Council The United Nations Security Council (UNSC) is one of the six principal organs of the United Nations (UN) and is charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, an ...
unanimously condemned the North Korean invasion of South Korea with Resolution 82. The Soviet Union, a veto-wielding power, had boycotted Council meetings since January 1950, protesting
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
's occupation of China's permanent seat. The Security Council, on 27 June 1950, published Resolution 83 recommending member states provide military assistance to the Republic of Korea. On 27 June President Truman ordered U.S. air and sea forces to help. On 4 July the Soviet deputy foreign minister accused the U.S. of starting armed intervention on behalf of South Korea. The Soviet Union challenged the legitimacy of the war for several reasons. The ROK intelligence upon which Resolution 83 was based came from US Intelligence; North Korea was not invited as a sitting temporary member of the UN, which violated
UN Charter The Charter of the United Nations is the foundational treaty of the United Nations (UN). It establishes the purposes, governing structure, and overall framework of the United Nations System, UN system, including its United Nations System#Six ...
Article 32; and the fighting was beyond the Charter's scope, because the initial North–South border fighting was classed as a civil war. Because the Soviet Union was boycotting the Security Council, some legal scholars posited that deciding upon this type of action required the unanimous vote of all five permanent members. Within days of the invasion, masses of ROK soldiers—of dubious loyalty to the Syngman Rhee regime—were retreating southwards or defecting en masse to the northern side, the KPA. On 7 July the UNSC set up under the sponsorship of the British and French sides a Unified Command structure which was authorized to fly the blue flag of the UN but was not subject in any way to United Nations orders.


United States' response (July–August 1950)

As soon as word of the attack was received, Acheson informed Truman that the North Koreans had invaded South Korea. Truman and Acheson discussed a US invasion response and agreed the US was obligated to act, comparing the North Korean invasion with
Adolf Hitler Adolf Hitler (20 April 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Nazi Germany from 1933 until Death of Adolf Hitler, his suicide in 1945. Adolf Hitler's rise to power, He rose to power as the lea ...
's aggressions in the 1930s, and the mistake of
appeasement Appeasement, in an International relations, international context, is a diplomacy, diplomatic negotiation policy of making political, material, or territorial concessions to an aggressive power (international relations), power with intention t ...
must not be repeated. US industries were mobilized to supply materials, labor, capital, production facilities, and other services necessary to support the military objectives of the Korean War. Truman later explained he believed fighting the invasion was essential to the
containment Containment was a Geopolitics, geopolitical strategic foreign policy pursued by the United States during the Cold War to prevent the spread of communism after the end of World War II. The name was loosely related to the term ''Cordon sanitaire ...
of communism as outlined in the National Security Council Report 68 (NSC 68): In August 1950, Truman and Acheson obtained the consent of
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
to appropriate $12 billion for military action, equivalent to $ billion in . Because of the extensive defense cuts and emphasis on building a nuclear bomber force, none of the services were able to make a robust response with conventional military strength. General
Omar Bradley Omar Nelson Bradley (12 February 1893 – 8 April 1981) was a senior Officer (armed forces), officer of the United States Army during and after World War II, rising to the rank of General of the Army (United States), General of the Army. He wa ...
, Chair of the Joint Chiefs of Staff, was faced with deploying a force that was a shadow of its World War II counterpart. Acting on Acheson's recommendation, Truman ordered MacArthur, the Supreme Commander for the Allied Powers in Japan, to transfer matériel to the South Korean military, while giving air cover to evacuation of US nationals. Truman disagreed with advisers who recommended unilateral bombing of the North Korean forces and ordered the U.S. Seventh Fleet to protect Taiwan, whose government asked to fight in Korea. The US denied Taiwan's request for combat, lest it provokes retaliation from the PRC. Because the US had sent the Seventh Fleet to "neutralize" the Taiwan Strait, Chinese Premier
Zhou Enlai Zhou Enlai ( zh, s=周恩来, p=Zhōu Ēnlái, w=Chou1 Ên1-lai2; 5 March 1898 – 8 January 1976) was a Chinese statesman, diplomat, and revolutionary who served as the first Premier of the People's Republic of China from September 1954 unti ...
criticized the UN and US initiatives as "armed aggression on Chinese territory". The US supported the Kuomintang in Burma in the hope these KMT forces would harass China from the
southwest The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography. A '' compass rose'' is primarily composed of four cardinal directions—north, east, south, and west— ...
, thereby diverting Chinese resources from Korea.


The drive south and Pusan (July–September 1950)

The Battle of Osan, the first significant US engagement, involved the 540-soldier Task Force Smith, a small forward element of the 24th Infantry Division flown in from Japan. On 5 July 1950, Task Force Smith attacked the KPA at
Osan Osan (; ) is a Subdivisions of South Korea, city in Gyeonggi Province, South Korea, approximately south of Seoul. The population of the city is around 200,000. The local economy is supported by a mix of agricultural and industrial enterprises. ...
but without weapons capable of destroying KPA tanks. The KPA defeated the US, with 180 American casualties. The KPA progressed southwards, pushing back US forces at Pyongtaek, Chonan, and Chochiwon, forcing the 24th Division's retreat to Taejeon, which the KPA captured in the Battle of Taejon. The 24th Division suffered 3,602 dead and wounded and 2,962 captured, including its commander, Major General William F. Dean. By August, the KPA steadily pushed back the ROK and the
Eighth United States Army The Eighth Army is a U.S. field army which commands all United States Army forces in South Korea. It is headquartered at the Camp Humphreys in the Anjeong-ri of Pyeongtaek, Pyeongtaek, South Korea.Pusan. This perimeter enclosed about 10% of Korea, in a line defined by the Nakdong River. The KPA purged South Korea's intelligentsia by killing civil servants and intellectuals. On 20 August, MacArthur warned Kim Il Sung he would be held responsible for KPA atrocities. Kim's early successes led him to predict the war would finish by the end of August. Chinese leaders were more pessimistic. To counter a possible US deployment, Zhou secured a Soviet commitment to have the Soviet Union support Chinese forces with air cover, and he deployed 260,000 soldiers along the Korean border, under the command of Gao Gang. Zhou authorized a topographical survey of Korea and directed Lei Yingfu, Zhou's military adviser in Korea, to analyze the military situation. Lei concluded MacArthur would likely attempt a landing at Incheon. After conferring with Mao that this would be MacArthur's most likely strategy, Zhou briefed Soviet and North Korean advisers of Lei's findings, and issued orders to PLA commanders to prepare for US naval activity in the
Korea Strait The Korea Strait is a strait, sea passage in East Asia between the Korean Peninsula and Japan. It connects the East China Sea, the Yellow Sea and the Sea of Japan in the northwest Pacific Ocean. The strait is split by Tsushima Island into two par ...
. In the resulting Battle of Pusan Perimeter, UN forces withstood KPA attacks meant to capture the city at the Naktong Bulge, P'ohang-dong, and
Taegu Daegu (; ), formerly spelled Taegu and officially Daegu Metropolitan City (), is a city in southeastern South Korea. It is the third-largest urban agglomeration in South Korea after Seoul and Busan; the fourth-largest List of provincial-level ci ...
. The
United States Air Force The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its ori ...
(USAF) interrupted KPA logistics with 40 daily ground support
sortie A sortie (from the French word meaning ''exit'' or from Latin root ''surgere'' meaning to "rise up") is a deployment or dispatch of one military unit, be it an aircraft, ship, or troops, from a strongpoint. The term originated in siege warf ...
s, which destroyed 32 bridges, halting daytime road and rail traffic. KPA forces were forced to hide in tunnels by day and move only at night. To deny military equipment and supplies to the KPA, the USAF destroyed logistics depots, refineries, and harbors, while U.S. Navy aircraft attacked transport hubs. Consequently, the overextended KPA could not be supplied throughout the south. On 27 August, 67th Fighter Squadron aircraft mistakenly attacked facilities in Chinese territory, and the Soviet Union called the Security Council's attention to China's complaint about the incident. The US proposed a commission of India and Sweden determine what the US should pay in compensation, but the Soviets vetoed this. Meanwhile, US garrisons in Japan continually dispatched soldiers and military supplies to reinforce defenders in the Pusan Perimeter. MacArthur went so far as to call for Japan's rearmament. Tank battalions deployed to Korea, from the port of San Francisco to the port of Pusan, the largest Korean port. By late August, the Pusan Perimeter had 500 medium tanks battle-ready. In early September 1950, UN forces outnumbered the KPA 180,000 to 100,000 soldiers.


Battle of Incheon (September 1950)

Against the rested and rearmed Pusan Perimeter defenders and their reinforcements, the KPA were undermanned and poorly supplied; unlike the UN, they lacked naval and air support. To relieve the Pusan Perimeter, MacArthur recommended an amphibious landing at Incheon, near Seoul, well over behind the KPA lines. On 6 July, he ordered Major General Hobart R. Gay, commander of the U.S. 1st Cavalry Division, to plan an amphibious landing at Incheon; on 12–14 July, the 1st Cavalry Division embarked from
Yokohama is the List of cities in Japan, second-largest city in Japan by population as well as by area, and the country's most populous Municipalities of Japan, municipality. It is the capital and most populous city in Kanagawa Prefecture, with a popu ...
, Japan, to reinforce the 24th Infantry Division inside the Pusan Perimeter. Soon after the war began, MacArthur began planning an Incheon landing, but
the Pentagon The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As ...
opposed him. When authorized, he activated a combined
US Army The United States Army (USA) is the primary land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of the United Stat ...
and Marine Corps, and ROK force. The X Corps, consisted of 40,000 troops of the 1st Marine Division, the 7th Infantry Division and around 8,600 ROK soldiers. By 15 September, the amphibious force faced few KPA defenders at Incheon: military intelligence,
psychological warfare Psychological warfare (PSYWAR), or the basic aspects of modern psychological operations (PsyOp), has been known by many other names or terms, including Military Information Support Operations ( MISO), Psy Ops, political warfare, "Hearts and Mi ...
,
guerrilla Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, Partisan (military), partisans, paramilitary personnel or armed civilians, which may include Children in the military, recruite ...
reconnaissance, and protracted bombardment facilitated a light battle. However, the bombardment destroyed most of Incheon.


Breakout from the Pusan Perimeter

On 16 September Eighth Army began its breakout from the Pusan Perimeter. Task Force Lynch, 3rd Battalion,
7th Cavalry Regiment The 7th Cavalry Regiment is a United States Army cavalry regiment formed in 1866. Its official nickname is "Garryowen", after the Irish air " Garryowen" that was adopted as its march tune. The regiment participated in some of the largest ba ...
, and 70th Tank Battalion units advanced through of KPA territory to join the 7th Infantry Division at Osan on 27 September. X Corps rapidly defeated the KPA defenders around Seoul, thus threatening to trap the main KPA force. On 18 September, Stalin dispatched General H. M. Zakharov to advise Kim to halt his offensive around the Pusan Perimeter, and redeploy his forces to defend Seoul. Chinese commanders were not briefed on North Korean troop numbers or operational plans. Zhou suggested the North Koreans should attempt to eliminate the UN forces at Incheon only if they had reserves of at least 100,000 men; otherwise, he advised the North Koreans to withdraw their forces north. On 25 September, Seoul was recaptured by UN forces. US air raids caused heavy damage to the KPA, destroying most of its tanks and artillery. KPA troops in the south, instead of effectively withdrawing north, rapidly disintegrated, leaving
Pyongyang Pyongyang () is the Capital city, capital and largest city of North Korea, where it is sometimes labeled as the "Capital of the Revolution" (). Pyongyang is located on the Taedong River about upstream from its mouth on the Yellow Sea. Accordi ...
vulnerable. During the retreat, only 25,000-30,000 KPA soldiers managed to reach the KPA lines. On 27 September, Stalin convened an emergency session of the
Politburo A politburo () or political bureau is the highest organ of the central committee in communist parties. The term is also sometimes used to refer to similar organs in socialist and Islamist parties, such as the UK Labour Party's NEC or the Poli ...
, where he condemned the incompetence of the KPA command and held Soviet military advisers responsible for the defeat.


UN forces invade North Korea (September–October 1950)

On 27 September, MacArthur received secret National Security Council Memorandum 81/1 from Truman reminding him operations north of the 38th parallel was authorized only if "at the time of such operation there was no entry into North Korea by major Soviet or Chinese Communist forces, no announcements of intended entry, nor a threat to counter our operations militarily". On 29 September, MacArthur restored the government of the Republic of Korea under Syngman Rhee. The Joint Chiefs of Staff on 27 September sent MacArthur a comprehensive directive: it stated the primary goal was the destruction of the KPA, with the unification of the Peninsula under Rhee as a secondary objective "if possible"; the Joint Chiefs added this objective was dependent on whether the Chinese and Soviets would intervene, and was subject to changing conditions. On 30 September, Zhou warned the US that China was prepared to intervene if the US crossed the 38th parallel. Zhou attempted to advise KPA commanders on how to conduct a general withdrawal by using the same tactics that allowed Chinese Communist forces to escape Nationalist encirclement campaigns in the 1930s, but KPA commanders did not use these tactics effectively. Bruce Cumings argues, however, that the KPA's rapid withdrawal was strategic, with troops melting into the mountains from where they could launch guerrilla raids on the UN forces spread out on the coasts. By 1 October, the UN Command had driven the KPA past the 38th parallel, and RoK forces pursued the KPA northwards. MacArthur demanded the KPA's unconditional surrender. On 7 October, with UN authorization, the UN Command forces followed the ROK forces northwards. The Eighth US Army drove up western Korea and captured Pyongyang on 19 October. On 20 October, the US 187th Airborne Regiment made their first of their two combat jumps during the war at Sunchon and Sukchon. The mission was to cut the road north to China, prevent North Korean leaders from escaping Pyongyang, and rescue US
prisoners of war A prisoner of war (POW) is a person held captive by a belligerent power during or immediately after an armed conflict. The earliest recorded usage of the phrase "prisoner of war" dates back to 1610. Belligerents hold prisoners of war for a ...
. At month's end, UN forces held 135,000 KPA prisoners of war. As they neared the Sino-Korean border, the UN forces in the west were divided from those in the east by of mountainous terrain. In addition to the 135,000 captured, the KPA had suffered some 200,000 soldiers killed or wounded, for a total of 335,000 casualties since the end of June 1950, and lost 313 tanks. A mere 25,000 KPA regulars retreated across the 38th parallel, as their military had collapsed. The UN forces on the peninsula numbered 229,722 combat troops (including 125,126 Americans and 82,786 South Koreans), 119,559 rear area troops, and 36,667 US Air Force personnel. MacArthur believed it necessary to extend the war into China to destroy depots supplying the North Korean effort. Truman disagreed and ordered caution at the Sino-Korean border.


China intervenes (October–December 1950)

On 3 October 1950, China attempted to warn the US, through its embassy in India, it would intervene if UN forces crossed the Yalu River. The US did not respond as policymakers in Washington, including Truman, considered it a bluff. On 15 October Truman and MacArthur met at Wake Island. This was much publicized because of MacArthur's discourteous refusal to meet the president in the contiguous US. To Truman, MacArthur speculated there was little risk of Chinese intervention in Korea, and the PRC's opportunity for aiding the KPA had lapsed. He believed the PRC had 300,000 soldiers in Manchuria and 100,000–125,000 at the Yalu River. He concluded that, although half of those forces might cross south, "if the Chinese tried to get down to Pyongyang, there would be the greatest slaughter" without Soviet air force protection. Meanwhile on 13 October, the
Politburo A politburo () or political bureau is the highest organ of the central committee in communist parties. The term is also sometimes used to refer to similar organs in socialist and Islamist parties, such as the UK Labour Party's NEC or the Poli ...
decided China would intervene even without Soviet air support, basing its decision on a belief superior morale could defeat an enemy that had superior equipment. To that end, 200,000 Chinese
People's Volunteer Army The People's Volunteer Army (PVA), officially the Chinese People's Volunteers (CPV), was the armed expeditionary forces China in the Korean War, deployed by the History of the People's Republic of China (1949–1976), People's Republic of Chi ...
(PVA) troops crossed the Yalu into North Korea. UN aerial reconnaissance had difficulty sighting PVA units in the daytime, because their march and bivouac discipline minimized detection. The PVA marched "dark-to-dark" (19:00–03:00), and aerial camouflage (concealing soldiers, pack animals, and equipment) was deployed by 05:30. Meanwhile, daylight advance parties scouted for the next bivouac site. During daylight activity or marching, soldiers remained motionless if an aircraft appeared; PVA officers were under orders to shoot security violators. Such battlefield discipline allowed a three- division army to march the from An-tung, Manchuria, to the combat zone in 19 days. Another division night-marched a circuitous mountain route, averaging daily for 18 days. After secretly crossing the Yalu River on 19 October, the PVA 13th Army Group launched the First Phase Offensive on 25 October, attacking advancing UN forces near the Sino-Korean border. This decision made solely by China changed the attitude of the Soviet Union. Twelve days after PVA troops entered the war, Stalin allowed the
Soviet Air Forces The Soviet Air Forces (, VVS SSSR; literally "Military Air Forces of the Union of Soviet Socialist Republics"; initialism VVS, sometimes referred to as the "Red Air Force") were one of the air forces of the Soviet Union. The other was the Sovie ...
to provide air cover and supported more aid to China. After inflicting heavy losses on the ROK II Corps at the Battle of Onjong, the first confrontation between Chinese and US military occurred on 1 November 1950. Deep in North Korea, thousands of soldiers from the PVA 39th Army encircled and attacked the US 8th Cavalry Regiment with three-prong assaults—from the north, northwest, and west—and overran the defensive position flanks in the Battle of Unsan. On 13 November, Mao appointed Zhou overall commander and coordinator of the war effort, with
Peng Dehuai Peng Dehuai (October 24, 1898November 29, 1974; also spelled as Peng Teh-Huai) was a Chinese general and politician who was the Minister of National Defense (China), Minister of National Defense from 1954 to 1959. Peng was born into a poor ...
as field commander. On 25 November, on the Korean western front, the PVA 13th Army Group attacked and overran the ROK II Corps at the Battle of the Ch'ongch'on River, and then inflicted heavy losses on the US 2nd Infantry Division on the UN forces' right flank. Believing they could not hold against the PVA, the Eighth Army began to retreat, crossing the 38th parallel in mid-December. In the east, on 27 November, the PVA 9th Army Group initiated the Battle of Chosin Reservoir. Here, the UN forces fared better: like the Eighth Army, the surprise attack forced X Corps to retreat from northeast Korea, but they were able to break out from the attempted encirclement by the PVA and execute a successful tactical withdrawal. X Corps established a defensive perimeter at the port city of
Hungnam Hŭngnam () is a district of Hamhung, the second largest city in North Korea. It is a port city on the eastern coast on the Sea of Japan. It is only from the slightly inland city of Hamhung. In 2005 it became a ward of Hamhung. History The por ...
on 11 December and evacuated by 24 December, to reinforce the depleted Eighth Army to the south. About 193 shiploads of UN forces and matériel (approximately 105,000 soldiers, 98,000 civilians, 17,500 vehicles, and 350,000 tons of supplies) were evacuated to Pusan. The SS ''Meredith Victory'' was noted for evacuating 14,000 refugees, the largest rescue operation by a single ship, even though it was designed to hold 12 passengers. Before escaping, the UN forces razed most of Hungnam, with particular attention to the port. In early December UN forces, including the
British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...
's 29th Infantry Brigade, evacuated Pyongyang along with refugees. Around 4.5 million North Koreans are estimated to have fled South or elsewhere abroad. On 16 December Truman declared a national state of emergency with Proclamation No. 2914, 3 C.F.R. 99 (1953), which remained in force until September 1978. The next day, 17 December, Kim Il Sung was deprived of the right of command of KPA by China.


Fighting around the 38th parallel (January–June 1951)

A ceasefire presented by the UN to the PRC, after the Battle of the Ch'ongch'on River on 11 December, was rejected by the PRC, which was convinced of the PVA's invincibility after its victory in that battle and the wider Second Phase Offensive. With Lieutenant General
Matthew Ridgway Matthew Bunker Ridgway (3 March 1895 – 26 July 1993) was a senior officer in the United States Army, who served as Supreme Allied Commander Europe (1952–1953) and the 19th Chief of Staff of the United States Army (1953–1955). Although he ...
assuming command of the Eighth Army on 26 December following the death of previous Eighth Army commander Walton Walker, the PVA and the KPA launched their Third Phase Offensive on New Year's Eve. Using night attacks in which UN fighting positions were encircled and assaulted by numerically superior troops, who had the element of surprise, the attacks were accompanied by loud trumpets and gongs, which facilitated tactical communication and disoriented the enemy. UN forces had no familiarity with this tactic, and some soldiers panicked, abandoning their weapons and retreating to the south. The offensive overwhelmed UN forces, allowing the PVA and KPA to capture Seoul for the second time on 4 January 1951. These setbacks prompted MacArthur to consider using
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission or atomic bomb) or a combination of fission and fusion reactions (thermonuclear weapon), producing a nuclear exp ...
s against the Chinese or North Korean interiors, intending radioactive fallout zones to interrupt the Chinese supply chains. However, upon the arrival of the charismatic General Ridgway, the ''esprit de corps'' of the bloodied Eighth Army revived. UN forces retreated to
Suwon Suwon (; ) is the largest city and capital of Gyeonggi Province, South Korea's most populous province. The city lies approximately south of the national capital, Seoul. With a population of 1.2 million, Suwon has more inhabitants than Ulsan, tho ...
in the west,
Wonju Wonju (; ) is the most populous Administrative divisions of South Korea, city in Gangwon Province, South Korea, with a population of 364,860 as of 2023. The city is located approximately east of Seoul. History During the time of Joseon, Gr ...
in the center, and the territory north of Samcheok in the east, where the battlefront stabilized and held. The PVA had outrun its logistics capability and thus were unable to press on beyond Seoul as food, ammunition, and matériel were carried nightly, on foot and bicycle, from the border at the Yalu River to the three battle lines. On 25 late January, upon finding that the PVA had abandoned their battle lines, Ridgway ordered a reconnaissance-in-force, which became Operation Thunderbolt. A full-scale advance fully exploited the UN's air superiority, concluding with the UN forces reaching the Han River and recapturing Wonju. Following the failure of ceasefire negotiations in January, the
United Nations General Assembly The United Nations General Assembly (UNGA or GA; , AGNU or AG) is one of the six principal organs of the United Nations (UN), serving as its main deliberative, policymaking, and representative organ. Currently in its Seventy-ninth session of th ...
passed Resolution 498 on 1 February, condemning the PRC as an aggressor and calling upon its forces to withdraw from Korea. In early February, the ROK 11th Division ran an operation to destroy guerrillas and pro-DPRK sympathizers in the
South Gyeongsang Province South Gyeongsang Province (, ) is a province in the southeast of South Korea. The provincial capital is at Changwon. It is adjacent to the major metropolitan center and port of Busan. The UNESCO World Heritage Site Haeinsa, a Buddhist temple tha ...
. The division and police committed the Geochang and Sancheong–Hamyang massacres. In mid-February, the PVA counterattacked with the Fourth Phase Offensive and achieved victory at Hoengseong. However, the offensive was blunted by US IX Corps at Chipyong-ni in the center. The US 23rd Regimental Combat Team and French Battalion fought a short but desperate battle that broke the attack's momentum. The battle is sometimes known as the " Gettysburg of the Korean War": 5,600 U.S., and French troops were surrounded by 25,000 PVA. UN forces had previously retreated in the face of large PVA/KPA forces instead of getting cut off, but this time, they stood and won. In the last two weeks of February 1951, Operation Thunderbolt was followed by Operation Killer, carried out by the revitalized Eighth Army. It was a full-scale, battlefront-length attack staged for maximum exploitation of firepower to kill as many KPA and PVA troops as possible. Operation Killer concluded with US I Corps re-occupying the territory south of the Han River, and IX Corps capturing Hoengseong. On 7 March the Eighth Army attacked with Operation Ripper, expelling the PVA and the KPA from Seoul on 14 March. This was the fourth and final conquest of the city in a year, leaving it a ruin; the 1.5 million pre-war population was down to 200,000 and people were suffering from food shortages. On 6 March MacArthur gave a press conference at Suwon where he stated "Assuming no diminution of the enemy's flow of ground forces and materiel to the Korean battle area, a continuation of the existing limitation upon our freedom of counter-offensive action, and no major additions to our organizational strength, the battle lines cannot fail in time to reach a point of theoretical stalemate." No one in Washington disputed MacArthur's prediction that a stalemate could develop out of the conditions obtaining. But a military victory, because of the commitments and risks an attempt to achieve it would entail, was no longer considered a practical objective. The preferred course, preferred because it would be consistent with the greater strategy and ongoing preparations against the possibility of world war, was to seek a cease-fire and a negotiated settlement of Korean issues. On 12 March Ridgway gave his own press conference at his command post at Yoju stating that regaining the 38th parallel would be a "tremendous victory" for the Eighth Army. It would mean that the encroachment of communism in Korea had been stopped - exactly what the UNC had set out to accomplish. Conversely, if the Chinese failed to drive the UNC out of Korea, they would have "failed monumentally." In any case, he emphasized, "we didn't set out to conquer China." In late April, Peng sent his deputy, Hong Xuezhi, to brief Zhou in Beijing. What Chinese soldiers feared, Hong said, was not the enemy, but having no food, bullets, or trucks to transport them to the rear when they were wounded. Zhou attempted to respond to the PVA's logistical concerns by increasing Chinese production and improving supply methods, but these were never sufficient. Large-scale air defense training programs were carried out and the
People's Liberation Army Air Force The People's Liberation Army Air Force, also referred to as the Chinese Air Force () or the People's Air Force (), is the primary aerial warfare service of the People's Liberation Army. The PLAAF controls most of the PLA's air assets, includi ...
(PLAAF) began participating in the war from September 1951 onward. The Fourth Phase Offensive had failed to match the achievements of the Second Phase or the limited gains of the Third Phase. The UN forces, after earlier defeats and retraining, proved much harder to infiltrate by Chinese light infantry than in previous months. From 31 January to 21 April, the Chinese suffered 53,000 casualties. On 11 April Truman relieved General MacArthur as supreme commander in Korea for several reasons. MacArthur had crossed the 38th parallel in the mistaken belief the Chinese would not enter the war, leading to major allied losses. He believed the use of nuclear weapons should be his decision, not the president's. MacArthur threatened to destroy China unless it surrendered. While MacArthur felt total victory was the only honorable outcome, Truman was more pessimistic about his chances once involved in a larger war, feeling a truce and orderly withdrawal could be a valid solution. MacArthur was the subject of congressional hearings in May and June 1951, which determined he had defied the orders of the president and thus violated the
US Constitution The Constitution of the United States is the supreme law of the United States of America. It superseded the Articles of Confederation, the nation's first constitution, on March 4, 1789. Originally including seven articles, the Constitut ...
. A popular criticism of MacArthur was he never spent a night in Korea and directed the war from the safety of Tokyo. Ridgway was appointed supreme commander, and he regrouped the UN forces for successful counterattacks while General James Van Fleet assumed command of the Eighth Army. Further attacks depleted the PVA and KPA forces; Operations Courageous (23–28 March) and
Tomahawk A tomahawk is a type of single-handed axe used by the many Native Americans in the United States, Indian peoples and nations of North America, traditionally resembles a hatchet with a straight shaft. Etymology The name comes from Powhatan langu ...
(23 March) (a combat jump by the 187th Airborne Regimental Combat Team) were joint ground and airborne infiltrations meant to trap PVA forces between Kaesong and Seoul. UN forces advanced to the ''Kansas Line'', north of the 38th parallel. The PVA counterattacked in April 1951, with the Fifth Phase Offensive, with three field armies (700,000 men). The first thrust of the offensive fell upon I Corps, which fiercely resisted in the Battle of the Imjin River (22–25 April) and Battle of Kapyong (22–25 April), blunting the impetus of the offensive, which was halted at the ''No-name Line'' north of Seoul. Casualty ratios were grievously disproportionate; Peng had expected a 1:1 or 2:1 ratio, but instead, Chinese combat casualties from 22 to 29 April totaled between 40,000 and 60,000 compared to only 4,000 for the UN—a ratio between 10:1 and 15:1. By the time Peng had called off the attack in the western sector on 29 April, the three participating armies had lost a third of their front-line combat strength within a week. On 15 May the PVA commenced the second impulse of the spring offensive and attacked the ROK and U.S. X Corps in the east at the Soyang River. Approximately 370,000 PVA and 114,000 KPA troops had been mobilized, with the bulk attacking in the eastern sector, with about a quarter attempting to pin the I Corps and IX Corps in the western sector. After initial success, they were halted by 20 May and repulsed over the following days, with Western histories generally designating 22 May as the end of the offensive. At month's end, the Chinese planned the third step of the Fifth Phase Offensive (withdrawal), which they estimated would take 10 to 15 days to complete for their 340,000 remaining men, and set the date for the night of 23 May. They were caught off guard when the Eighth Army counterattacked and regained the ''Kansas Line'' on the morning of 12 May, 23 hours before the expected withdrawal.Xiaobing 2014, p. 181. The surprise attack turned the retreat into "the most severe loss since our forces had entered Korea"; between 16 and 23 May, the PVA suffered another 45,000 to 60,000 casualties before their soldiers managed to evacuate. The Fifth Phase Offensive as a whole had cost the PVA 102,000 soldiers (85,000 killed/wounded, 17,000 captured), with significant losses for the KPA. The end of the Fifth Phase Offensive preceded the start of the UN May–June 1951 counteroffensive. During the counteroffensive, the US-led coalition captured land up to about north of the 38th parallel, with most forces stopping at the ''Kansas Line'' and a minority going further to the ''Wyoming Line.'' PVA and KPA forces suffered greatly, especially in the Chuncheon sector and at Chiam-ni and Hwacheon; in the latter sector alone the PVA/KPA suffered over 73,207 casualties, including 8,749 captured, compared to 2,647 total casualties of the IX Corps. The halt at the ''Kansas Line'' and offensive action stand-down began the stalemate that lasted until the armistice of 1953. The disastrous failure of the Fifth Phase Offensive (which Peng recalled as one of only four mistakes he made in his military career) "led Chinese leaders to change their goal from driving the UNF out of Korea to merely defending China's security and ending the war through negotiations".


Stalemate (July 1951–July 1953)

For the rest of the war, the UN and the PVA/KPA fought but exchanged little territory. Large-scale bombing of North Korea continued, and protracted armistice negotiations began on 10 July 1951 at Kaesong in the North. On the Chinese side, Zhou directed peace talks, and Li Kenong and Qiao Guanghua headed the negotiation team. Combat continued; the goal of the UN forces was to recapture all of South Korea and avoid losing territory. The PVA and the KPA attempted similar operations and later effected military and psychological operations to test the UN Command's resolve to continue the war. The sides constantly traded artillery fire along the front, with American-led forces possessing a large firepower advantage over Chinese-led forces. In the last three months of 1952 the UN fired 3,553,518 field gun shells and 2,569,941 mortar shells, while the communists fired 377,782 field gun shells and 672,194 mortar shells: a 5.8:1 ratio. The communist insurgency, reinvigorated by North Korean support and scattered bands of KPA stragglers, resurged in the south. In the autumn of 1951, Van Fleet ordered Major General Paik Sun-yup to break the back of guerrilla activity. The UN's limited offensive (31 August – 12 November) to shorten and straighten sections of the lines, acquire better defensive terrain, and deny the enemy key vantage points, saw heavy fighting by UN forces, with I Corps and X Corps making limited tactical advances against PVA and KPA forces. The campaign resulted in approximately 60,000 casualties, including 22,000 Americans. The intense battles at Bloody Ridge, the Punchbowl and Heartbreak Ridge underscored the challenges of penetrating the Chinese "active defense." Despite PVA/KPA losses of 100,000–150,000 troops, these were not crippling, and the PVA forces remained resolute. By November, the UNC abandoned major offensive operations, and the PVA launched counterattacks with some success. From December 1951 to March 1952, ROK security forces claimed to have killed 11,090 partisans and sympathizers and captured 9,916 more. PVA troops suffered from deficient military equipment, logistical problems, overextended communication and supply lines, and the constant threat of UN bombers. These factors led to a rate of Chinese casualties far greater than the casualties suffered by UN troops. The situation became so serious that in November 1951 Zhou called a conference in
Shenyang Shenyang,; ; Mandarin pronunciation: ; formerly known as Fengtian formerly known by its Manchu language, Manchu name Mukden, is a sub-provincial city in China and the list of capitals in China#Province capitals, provincial capital of Liaonin ...
to discuss the PVA's logistical problems. It was decided to accelerate the construction of railways and airfields, to increase the trucks available to the army, and to improve air defense by any means possible. These commitments did little to address the problems. In the months after the Shenyang conference, Peng went to Beijing several times to brief Mao and Zhou about the heavy casualties and the increasing difficulty of keeping front lines supplied with basic necessities. Peng was convinced the war would be protracted and that neither side would be able to achieve victory in the near future. On 24 February 1952, the Military Commission, presided over by Zhou, discussed the PVA's logistical problems with members of government agencies. After government representatives emphasized their inability to meet the war demands, Peng shouted: "You have this and that problem... You should go to the front and see with your own eyes what food and clothing the soldiers have! Not to speak of the casualties! For what are they giving their lives? We have no aircraft. We have only a few guns. Transports are not protected. More and more soldiers are dying of starvation. Can't you overcome some of your difficulties?" The atmosphere became so tense Zhou was forced to adjourn the conference. Zhou called a series of meetings, where it was agreed the PVA would be divided into three groups, to be dispatched to Korea in shifts; to accelerate training of pilots; to provide more anti-aircraft guns to front lines; to purchase more military equipment and ammunition from the Soviet Union; to provide the army with more food and clothing; and to transfer the responsibility of logistics to the central government. General Mark W. Clark replaced General Ridgway as commander of the United Nations Command on 12 May 1952. With peace negotiations ongoing, the Chinese attempted a final offensive in the final weeks of the war to capture territory: on 10 June, 30,000 Chinese troops struck South Korean and U.S. divisions on a front, and on 13 July, 80,000 Chinese soldiers struck the east-central Kumsong sector, with the brunt of their attack falling on 4 South Korean divisions. The Chinese had success in penetrating South Korean lines but failed to capitalize, particularly when US forces responded with overwhelming firepower. Chinese casualties in their final major offensive (above normal wastage for the front) were about 72,000, including 25,000 killed compared to 14,000 for the UN (most were South Koreans, 1,611 were Americans). While Chinese forces grappled with significant logistical and supply difficulties, the stalemate also stemmed from mounting frustrations within the UNC. Despite superior firepower, the war proved difficult to fight and the US public was becoming impatient of a war that was lacking a victory. By mid-1951, the stalemate had worn away Truman's public approval, and political pressures mounted on the Truman administration to seek an end to the fighting. On 29 November 1952 U.S. President-elect
Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. During World War II, he was Supreme Commander of the Allied Expeditionar ...
went to Korea to learn what might end the war. Eisenhower took office on 20 January 1953 and his administration prioritized containment over rollback and sought to reduce American involvement in the conflict, contributing to the later armistice.


Armistice (July 1953–November 1954)

The on-again, off-again armistice negotiations continued for two years, first at Kaesong, then Panmunjom. A problematic point was
prisoner of war A prisoner of war (POW) is a person held captive by a belligerent power during or immediately after an armed conflict. The earliest recorded usage of the phrase "prisoner of war" dates back to 1610. Belligerents hold prisoners of war for a ...
repatriation. The PVA, KPA and UN Command could not agree on a system of repatriation because many PVA and KPA soldiers refused to be repatriated back to the north, which was unacceptable to the Chinese and North Koreans. On 3 December 1952 the UNGA accepted India's proposed Korean War armistice, voted as Resolution 610(VII), and thus was born the Neutral Nations Repatriation Commission. Stalin died on 5 March. The new Soviet leaders, engaged in their internal power struggle, had no desire to continue supporting China's efforts and called for an end to the hostilities. China could not continue without Soviet aid, and North Korea was no longer a major player. Armistice talks entered a new phase especially after the May 1953 test of the novel nuclear artillery shell by the Americans. The KPA, PVA and UN Command signed the armistice agreement on 27 July 1953. South Korean President Syngman Rhee refused to sign. The war ended at this point, even though there was no
peace treaty A peace treaty is an treaty, agreement between two or more hostile parties, usually country, countries or governments, which formally ends a declaration of war, state of war between the parties. It is different from an armistice, which is an ag ...
. North Korea nevertheless claims it won the war. Under the agreement, the belligerents established the Korean Demilitarized Zone (DMZ) which mostly follows the 38th parallel. In the eastern part, the DMZ runs north of the 38th parallel; to the west, it travels south of it. Kaesong, site of the initial negotiations, was in pre-war South Korea but is now part of North Korea. The DMZ has since been patrolled by the KPA and the ROKA, with the US still operating as the UN Command. Operation Glory was conducted from July to November 1954, to allow combatants to exchange their dead. The remains of 4,167 US Army and US Marine Corps dead were exchanged for 13,528 KPA and PVA dead, and 546 civilians dead in UN POW camps were delivered to the South Korean government. After Operation Glory, 416 Korean War unknown soldiers were buried in the National Memorial Cemetery of the Pacific, on
Oahu Oahu (, , sometimes written Oahu) is the third-largest and most populated island of the Hawaiian Islands and of the U.S. state of Hawaii. The state capital, Honolulu, is on Oahu's southeast coast. The island of Oahu and the uninhabited Northwe ...
, Hawaii. Defense Prisoner of War/Missing Personnel Office (DPMO) records indicate the PRC and North Korea transmitted 1,394 names, of which 858 were correct. From 4,167 containers of returned remains, forensic examination identified 4,219 individuals. Of these, 2,944 were identified as from the US, and all but 416 were identified by name. From 1996 to 2006, North Korea recovered 220 remains near the Sino-Korean border.


Continued division (1954–present)

The Armistice Agreement provided for monitoring by an international commission. Since 1953, the Neutral Nations Supervisory Commission, composed of members from the Swiss and Swedish armed forces, has been stationed near the DMZ. In April 1975,
South Vietnam South Vietnam, officially the Republic of Vietnam (RVN; , VNCH), was a country in Southeast Asia that existed from 1955 to 1975. It first garnered Diplomatic recognition, international recognition in 1949 as the State of Vietnam within the ...
's capital of Saigon was captured by the
People's Army of Vietnam The People's Army of Vietnam (PAVN), officially the Vietnam People's Army (VPA; , , ), also recognized as the Vietnamese Army (), the People's Army () or colloquially the Troops ( ), is the national Military, military force of the Vietnam, S ...
. Encouraged by that communist success, Kim Il Sung saw it as an opportunity to invade South Korea. Kim visited China in April 1975 and met with Mao and Zhou to ask for military aid. Despite Pyongyang's expectations, Beijing refused to help North Korea in another war. Since the armistice, there have been incursions and acts of aggression by North Korea. From 1966 to 1969, many cross-border incursions took place in what has been referred to as the Korean DMZ Conflict or Second Korean War. In 1968, a North Korean commando team unsuccessfully attempted to assassinate South Korean president
Park Chung Hee Park Chung Hee (; ; November14, 1917October26, 1979) was a South Korean politician and army officer who served as the third president of South Korea from 1962 after he seized power in the May 16 coup of 1961 until Assassination of Park Chung ...
in the Blue House Raid. In 1976, the Korean axe murder incident was widely publicized. Since 1974, 4 incursion tunnels leading to Seoul have been uncovered. In 2010, a North Korean submarine torpedoed and sank the South Korean
corvette A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper (or " rated") warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloo ...
, resulting in the deaths of 46 sailors. Again in 2010, North Korea fired artillery shells on Yeonpyeong island, killing 2 military personnel and 2 civilians. After a new wave of UN sanctions, on 11 March 2013, North Korea claimed that the armistice had become invalid. On 13 March, North Korea confirmed it ended the Armistice and declared North Korea "is not restrained by the North-South declaration on non-aggression". On 30 March, North Korea stated it entered a "state of war" and "the long-standing situation of the Korean peninsula being neither at peace nor at war is finally over". Speaking on 4 April, US Secretary of Defense Chuck Hagel said that Pyongyang "formally informed" the Pentagon that it "ratified" the potential use of a nuclear weapon against South Korea, Japan and the US, including Guam and Hawaii. Hagel stated the US would deploy the Terminal High Altitude Area Defense
anti-ballistic missile An anti-ballistic missile (ABM) is a surface-to-air missile designed to Missile defense, destroy in-flight ballistic missiles. They achieve this explosively (chemical or nuclear), or via hit-to-kill Kinetic projectile, kinetic vehicles, which ma ...
system to Guam because of a credible and realistic nuclear threat. In 2016, it was revealed North Korea approached the US about conducting formal peace talks to end the war officially. While the
White House The White House is the official residence and workplace of the president of the United States. Located at 1600 Pennsylvania Avenue Northwest (Washington, D.C.), NW in Washington, D.C., it has served as the residence of every U.S. president ...
agreed to secret peace talks, the plan was rejected because North Korea refused to discuss nuclear disarmament as part of the treaty. In 2018, it was announced that North Korea and South Korea agreed to talk to end the conflict. They committed themselves to the complete denuclearization of the Peninsula. North Korean leader
Kim Jong Un Kim Jong Un (born 8 January 1983 or 1984) is a North Korean politician and dictator who has served as supreme leader of North Korea since 2011 and general secretary of the Workers' Party of Korea (WPK) since 2012. He is the third son of Kim ...
and South Korean President Moon Jae-in signed the Panmunjom Declaration. In September 2021, Moon reiterated his call to end the war formally, in a speech at the UN.


Casualties

About 3 million people were killed in the war, mostly civilians, making it perhaps the deadliest conflict of the Cold War era. Samuel Kim lists the war as the deadliest conflict in East Asia—the region most affected by armed conflict related to the Cold War. Though only rough estimates of civilian fatalities are available, scholars have noted that the percentage of civilian casualties in Korea was higher than in World War II or the Vietnam War, with Bruce Cumings putting civilian casualties at 2 million and Guenter Lewy in the range of 2–3 million. According to one source, 1,658,436 civilians died, meaning a 74% civilian death rate. Cumings states that civilians represent at least half the war's casualties, while Lewy suggests it may have gone as high as 70%, compared to his estimates of 42% in World War II and 30–46% in Vietnam. Data compiled by the Peace Research Institute Oslo lists just under 1 million battle deaths over the war and a mid-estimate of 3 million total deaths, attributing the difference to excess mortality among civilians from one-sided massacres, starvation, and disease. Compounding this devastation for civilians, virtually all major cities on the Peninsula were destroyed. In per capita and absolute terms, North Korea was the most devastated by the war. According to Charles K. Armstrong, the war resulted in the death of an estimated 12%–15% of the North Korean population ( 10 million), "a figure close to or surpassing the proportion of World War II casualties of the Soviet Union, Soviet citizens killed in World War II".


Military

South Korea reported some 137,899 military deaths and 24,495 missing, 450,742 wounded, 8,343 POW. The US suffered 33,686 battle deaths, 7,586 missing, along with 2,830 non-battle deaths. There were 17,730 other non-battle US military deaths that occurred outside Korea during the same period that were erroneously included as war deaths until 2000. The US suffered 103,284 wounded in action. UN losses, excluding those of the US or South Korea, amounted to 4,141 dead and 12,044 wounded in action. American combat casualties were over 90% of non-Korean UN losses. US battle deaths were 8,516 up to their first engagement with the Chinese on 1 November 1950. The first four months prior to the Chinese intervention were by far the bloodiest per day for US forces, as they engaged the well-equipped KPA in intense fighting. American medical records show that from July to October 1950, the army sustained 31% of the combat deaths it ultimately incurred in the entire 37-month war. The US spent US$30 billion on the war. Some 1,789,000 American soldiers served in the war, accounting for 31% of the 5,720,000 Americans who served on active duty worldwide from June 1950 to July 1953. Deaths from non-American UN militaries totaled 3,730, with another 379 missing. Chinese sources reported that the PVA suffered 114,000 battle deaths, 21,000 deaths from wounds, 13,000 deaths from illness, 340,000 wounded, and 7,600 missing. 7,110 Chinese POWs were repatriated to China. In 2010, the Chinese government revised its official tally of war losses to 183,108 dead (114,084 in combat, 70,000 deaths from wounds, illness and other causes) and 21,374 POW, 25,621 missing."180,000 Chinese soldiers killed in Korean War, says Chinese general"
. China Daily, 28 June 2010. State Council Information Office, Chinese government, Beijing. "According to statistics compiled by the army's medical departments and hospitals, 114,084 servicemen were killed in military action or accidents, and 25,621 soldiers had gone missing. The other about 70,000 casualties died from wounds, illness and other causes, he said. To date, civil affairs departments have registered 183,108 war martyrs, Xu said."
Overall, 73% of Chinese infantry troops served in Korea (25 of 34 armies, or 79 of 109 infantry divisions, were rotated in). More than 52% of the Chinese air force, 55% of the tank units, 67% of the artillery divisions, and 100% of the railroad engineering divisions were sent to Korea as well. Chinese soldiers who served in Korea faced a greater chance of being killed than those who served in World War II or the Chinese Civil War. China spent over 10 billion yuan on the war (roughly US$3.3 billion), not counting USSR aid.Xiaobing 2009, p. 112. This included $1.3 billion in money owed to the Soviet Union by the end of it. This was a relatively large cost, as China had only 4% of the national income of the US. Spending on the war constituted 34–43% of China's annual government budget from 1950 to 1953, depending on the year. Despite its underdeveloped economy, Chinese military spending was the world's fourth largest globally for most of the war after that of the US, the Soviet Union, and the UK; however, by 1953, with the winding down of the Korean War and the escalation of the First Indochina War, French spending also surpassed Chinese spending by about a third. According to the South Korean Ministry of National Defense, North Korean military losses totaled 294,151 dead, 91,206 missing, and 229,849 wounded, giving North Korea the highest military deaths of any belligerent in absolute and relative terms.Andrew C. Nahm; James Hoare (2004). "Historical Dictionary of the Republic of Korea". Scarecrow Press, pp. 129–130. The PRIO Battle Deaths Dataset gave a similar figure for North Korean military deaths of 316,579.Bethany Lacina and Nils Petter Gleditsch, 2005. ―Monitoring Trends in Global Combat: A New Dataset of Battle Deaths.‖ European Journal of Population: 21(2–3): 145–166. Korean data available a
"The PRIO Battle Deaths Dataset, 1946–2008, Version 3.0"
, pp. 359–362
Chinese sources reported similar figures for the North Korean military of 290,000 "casualties" and 90,000 captured. The financial cost of the war for North Korea was massive indirect losses and lost economic activity; the country was devastated by the cost of the war and Bombing of North Korea 1950–1953, the American strategic bombing campaign, which, among other things, destroyed 85% of North Korea's buildings and 95% of its power generation. The Soviet Union suffered 299 dead, with 335 planes lost. The Chinese and North Koreans estimated that about 390,000 soldiers from the US, 660,000 soldiers from South Korea and 29,000 other UN soldiers were "eliminated" from the battlefield. Western sources estimate the PVA suffered about 400,000 killed and 486,000 wounded, while the KPA suffered 215,000 killed, 303,000 wounded, and over 101,000 captured or missing. Cumings cites a much higher figure of 900,000 fatalities among Chinese soldiers.


Civilian

According to the South Korean Ministry of National Defense, there were over 750,000 confirmed violent civilian deaths during the war, another million civilians were pronounced missing, and millions more ended up as refugees. Estimates of the number of civilians killed in the entire war range from 244,000 to 990,000 for South Korea. The North Korean government has never published estimates of civilian deaths in the war, but more than one million killed have been an estimate common among historians who have studied the Korean War. Over 1.5 million North Koreans fled to the South.


War crimes

There were numerous atrocities and massacres of civilians throughout the Korean War committed by both sides, starting in the war's first days. In 2005–2010, a Truth and Reconciliation Commission (South Korea), South Korean Truth and Reconciliation Commission investigated atrocities and other human rights violations through much of the 20th century, from the Japanese colonial empire, Japanese colonial period through the Korean War and beyond. It excavated some mass graves from the Bodo League massacres and confirmed the general outlines of those political executions. Of the Korean War-era massacres the commission was petitioned to investigate, 82% were perpetrated by South Korean forces, with 18% perpetrated by North Korean forces. The commission also received petitions alleging more than 200 large-scale killings of South Korean civilians by the U.S. military during the war, mostly air attacks. It confirmed several such cases, including refugees crowded into a cave attacked with napalm bombs, which survivors said killed 360 people, and an air attack that killed 197 refugees gathered in a field in the far south. It recommended South Korea seek reparations from the United States, but in 2010, a reorganized commission under a new, conservative government concluded that most U.S. mass killings resulted from "military necessity", while in a small number of cases, they concluded, the U.S. military had acted with "low levels of unlawfulness", but the commission recommended against seeking reparations. Almost every substantial building in North Korea was destroyed during the war. The war's highest-ranking U.S. POW, Major General William F. Dean, reported that the majority of North Korean cities and villages he saw were either rubble or snow-covered wasteland. North Korean factories, schools, hospitals, and government offices were forced to move underground, and air defenses were "non-existent". North Korea ranks as among the most heavily bombed countries in history, and the U.S. dropped a total of 635,000 tons of bombs (including 32,557 tons of napalm) on Korea, more than during the entire Pacific War. By the end of the war, eighteen of the twenty-two major cities in North Korea had been at least half obliterated according to damage assessments by the U.S. Air Force. During a Senate hearing in the spring of 1951, MacArthur expressed his horror at the devastation that the war was inflicting on the Koreans, describing it as the worst he had ever seen in his military career. As the most humane solution, MacArthur suggested that the war should be escalated in order to bring it to an end sooner.


Characteristics


U.S. unpreparedness

In postwar analysis of the unpreparedness of US forces deployed during the summer and fall of 1950, Army Major General Floyd L. Parks stated "Many who never lived to tell the tale had to fight the full range of ground warfare from offensive to delaying action, unit by unit, man by man ... [T]hat we were able to snatch victory from the jaws of defeat ... does not relieve us from the blame of having placed our own flesh and blood in such a predicament." By 1950, US Secretary of Defense Louis A. Johnson had established a policy of faithfully following Truman's defense economization plans and aggressively attempted to implement it, even in the face of steadily increasing external threats. He consequently received much of the blame for the initial setbacks and widespread reports of ill-equipped and inadequately trained military forces in the war's early stages. As an initial response to the invasion, Truman called for a naval blockade of North Korea and was shocked to learn that such a blockade could be imposed only "on paper" since the U.S. Navy no longer had the warships with which to carry out his request. Army officials, desperate for weaponry, Operation Roll-Up, recovered Sherman tanks and other equipment from Pacific War battlefields and reconditioned them for shipment to Korea. Army ordnance officials at Fort Knox pulled down M26 Pershing tanks from display pedestals around Fort Knox in order to equip the third company of the Army's hastily formed 70th Tank Battalion. Without adequate numbers of tactical fighter-bomber aircraft, the Air Force took North American P-51 Mustang, F-51 (P-51) propeller-driven aircraft out of storage or from existing Air National Guard squadrons and rushed them into front-line service. A shortage of spare parts and qualified maintenance personnel resulted in improvised repairs and overhauls. A Navy helicopter pilot aboard an active duty warship recalled fixing damaged rotor blades with masking tape in the absence of spares. U.S. United States Army Reserve, Army Reserve and Army National Guard infantry soldiers and new inductees (called to duty to fill out understrength infantry divisions) found themselves short of nearly everything needed to repel the North Korean forces: artillery, ammunition, heavy tanks, ground-support aircraft, even effective anti-tank weapons such as the Bazooka#Rocket Launcher, M20 "Super Bazooka", M20 3.5-inch (89 mm) "Super Bazooka". Some Army combat units sent to Korea were supplied with worn-out, "red-lined" M1 Garand, M1 rifles or M1 Carbine, carbines in immediate need of ordnance depot overhaul or repair. Only the Marine Corps, whose commanders had stored and maintained their World War II surplus inventories of equipment and weapons, proved ready for deployment, though they still were woefully understrength, as well as in need of suitable landing craft to practice amphibious operations (Secretary of Defense Louis Johnson had transferred most of the remaining craft to the Navy and reserved them for use in training Army units).


Armored warfare

The initial assault by KPA forces was aided by the use of Soviet T-34-85 tanks. A KPA Tank corps (Soviet Union), tank corps equipped with about 120 T-34s spearheaded the invasion. These faced an ROK that had few anti-tank weapons adequate to deal with the T-34s. Additional Soviet armor was added as the offensive progressed. The KPA tanks had a good deal of early successes against ROK infantry, Task Force Smith, and the U.S. M24 Chaffee light tanks that they encountered. Interdiction by ground attack aircraft was the only means of slowing the advancing KPA armor. The tide turned in favor of the UN forces in August 1950 when the KPA suffered major tank losses during a series of battles in which the UN forces brought heavier equipment to bear, including American M4 Sherman, M4A3 Sherman and M26 medium tanks, alongside British Centurion tank, Centurion, Churchill tank, Churchill and Cromwell tank, Cromwell tanks. The Incheon landings on 15 September cut off the KPA supply lines, causing their armored forces and infantry to run out of fuel, ammunition, and other supplies. As a result of this and the Pusan perimeter breakout, the KPA had to retreat, and many of the T-34s and heavy weapons had to be abandoned. By the time the KPA withdrew from the South, 239 T-34s and 74 SU-76 self-propelled guns were lost. After November 1950, KPA armor was rarely encountered. Following the initial assault by the North, the Korean War saw limited use of tanks and featured no large-scale tank battles. The mountainous, forested terrain, especially in the eastern central zone, was poor tank country, limiting their mobility. Through the last two years of the war in Korea, UN tanks served largely as infantry support and mobile artillery pieces.


Naval warfare

Because neither Korea had a significant navy, the war featured few naval battles. A skirmish between North Korea and the UN Command occurred on 2 July 1950; the U.S. Navy cruiser , the Royal Navy cruiser and the Royal Navy frigate fought four North Korean torpedo boats and two mortar gunboats, and sank them. USS ''Juneau'' later sank several ammunition ships that had been present. The last sea battle of the Korean War occurred days before the Battle of Incheon; the ROK ship ''PC-703'' sank a North Korean minelayer in the Battle of Haeju Island, near Incheon. Three other supply ships were sunk by ''PC-703'' two days later in the Yellow Sea. During most of the war, the UN navies patrolled the west and east coasts of North Korea, sinking supply and ammunition ships and denying the North Koreans the ability to resupply from the sea. Aside from very occasional gunfire from North Korean shore batteries, the main threat to UN navy ships was from magnetic mines. During the war, five U.S. Navy ships were lost to mines: two minesweepers, two minesweeper escorts, and one ocean tug. Mines and coastal artillery damaged another 87 U.S. warships.


Aerial warfare

The war was the first in which jet aircraft played the central role in air combat. Once-formidable fighters such as the P-51 Mustang, F4U Corsair, and Hawker Sea Fury—all Reciprocating engine, piston-engined, propeller-driven, and designed during World War II—relinquished their air-superiority roles to a new generation of faster, turbojet, jet-powered fighters arriving in the theater. For the initial months of the war, the P-80 Shooting Star, F9F Panther, Gloster Meteor, and other jets under the UN flag dominated the Korean People's Air Force (KPAF) propeller-driven Soviet Yakovlev Yak-9 and Lavochkin La-9s. By early August 1950, the KPAF was reduced to only about 20 planes. The Chinese intervention in late October 1950 bolstered the KPAF with the MiG-15, one of the world's most advanced jet fighters. The USAF countered the MiG-15 by sending over three squadrons of its most capable fighter, the F-86 Sabre. These arrived in December 1950. The Soviet Union denied the involvement of their personnel in anything other than an advisory role, but air combat quickly resulted in Soviet pilots dropping their code signals and speaking over the radio in Russian. This known direct Soviet participation was a ''casus belli'' that the UN Command deliberately overlooked, lest the war expand to include the Soviet Union and potentially escalate into atomic warfare. After the war and to the present day, the USAF reported an inflated F-86 Sabre Loss exchange ratio, kill ratio in excess of 10:1, with 792 MiG-15s and 108 other aircraft shot down by Sabres, and 78 Sabres lost to enemy fire. The Soviet Air Force reported some 1,100 air-to-air victories and 335 MiG combat losses, while China's PLAAF reported 231 combat losses, mostly MiG-15s, and 168 other aircraft lost. The KPAF reported no data, but the UN Command estimates some 200 KPAF aircraft lost in the war's first stage, and 70 additional aircraft after the Chinese intervention. The USAF disputes Soviet and Chinese claims of 650 and 211 downed F-86s, respectively. More modern American estimates place the overall USAF kill ratio at around 1.8:1 with the ratio dropping to 1.3:1 against MiG-15s with Soviet pilots but increasing to a dominant 12:1 against Chinese and North Korean adversaries. Reports by Lieutenant General Sidor Slyusarev, commander of Soviet air forces in Korea, are more favorable to the communist side. The 64th Corps claimed a total 1,097 enemy aircraft of all types during operations, for the loss of 335 aircraft (including lost to enemy ground fire, accidents, etc.) and 110 pilots. Soviet reports put the overall kill ratio at 3.4:1 in favor of Soviet pilots. As reported, effectiveness of the Soviet fighters declined as the war progressed. from an overall kill ratio of 7.9:1 from November 1950 through January 1952, declining to 2.2:1 in later 1952 and 1.9:1 in 1953. This was because more advanced jet fighters appeared on the UN side as well as improved U.S. tactics. Regardless of the actual ratio, American Sabres were very effective at controlling the skies over Korea. Since no other UN fighter could contend with the MiG-15, F-86s largely took over air combat once they arrived, relegating other aircraft to air-to-ground operations. Despite much greater numbers (the number of Sabres in theater never exceeded 150 while MiG-15s reached 900 at their peak), communist aircraft were seldom encountered south of Pyongyang. UN ground forces, supply lines, and infrastructure were not attacked from the air. Although North Korea had 75 airfields capable of supporting MiGs, after 1951, any serious effort to operate from them was abandoned. The MiGs were instead based across the Yalu River in the safety of China. This confined most air-to-air engagements to MiG Alley. UN aircraft had free rein to conduct strike missions over enemy territory with little fear of interception. Although jet dogfights are remembered as a prominent part of the Korean War, counter-air missions comprised just 12% of Far East Air Forces sorties, and four times as many sorties were performed for close air support and interdiction. The war marked a major milestone not only for fixed-wing aircraft, but also for rotorcraft, featuring the first large-scale deployment of helicopters for medical evacuation (medevac). In 1944–45, during World War II, the Sikorsky R-4, YR-4 helicopter had seen limited ambulance duty. In Korea, where rough terrain prevented use of the jeep as a speedy medevac vehicle, helicopters like the Sikorsky H-19 Chickasaw, Sikorsky H-19 were heavily used. This helped reduce fatal casualties to a dramatic degree when combined with complementary medical innovations such as Mobile Army Surgical Hospitals (MASH). As such, the medical evacuation and care system for the wounded was so effective for the UN forces that a wounded soldier who arrived at a MASH unit alive typically had a 97% chance of survival. The limitations of jet aircraft for close air support highlighted the helicopter's potential in the role, leading to the development of the helicopter gunships used in the Vietnam War.


U.S. threat of atomic warfare

On 5 November 1950, the U.S. Joint Chiefs of Staff issued orders for the retaliatory atomic bombing of Manchurian PRC military bases, if either of their armies crossed into Korea or if PRC or KPA bombers attacked Korea from there. President Truman ordered the transfer of nine Mark 4 nuclear bombs "to the Air Force's 9th Bombardment Wing, Heavy, Ninth Bomb Group, the designated carrier of the weapons ... [and] signed an order to use them against Chinese and Korean targets", which he never transmitted. Many U.S. officials viewed the deployment of nuclear-capable (but not nuclear-armed) B-29 bombers to Britain as helping to resolve the Berlin Blockade of 1948–1949. Truman and Eisenhower both had military experience and viewed nuclear weapons as potentially usable components of their military. During Truman's first meeting to discuss the war on 25 June 1950, he ordered plans be prepared for attacking Soviet forces if they entered the war. By July, Truman approved another B-29 deployment to Britain, this time with bombs (but without their Pit (nuclear weapon), cores), to remind the Soviets of U.S. offensive ability. Deployment of a similar fleet to Guam was leaked to ''The New York Times''. As UN forces retreated to Pusan, and the CIA reported that mainland China was building up forces for a possible invasion of Taiwan, the Pentagon believed that Congress and the public would demand using nuclear weapons if the situation in Korea required them. As PVA forces pushed back the UN forces from the Yalu River, Truman stated during a 30 November 1950 press conference that using nuclear weapons was "always [under] active consideration", with control under the local military commander. Indian ambassador Kavalam Madhava Panikkar, K. Madhava Panikkar reports "that Truman announced he was thinking of using the atom bomb in Korea. But the Chinese seemed unmoved by this threat ... The PRC's propaganda against the U.S. was stepped up. The 'Aid Korea to resist America' campaign was made the slogan for increased production, greater national integration, and more rigid control over anti-national activities. One could not help feeling that Truman's threat came in useful to the leaders of the Revolution, to enable them to keep up the tempo of their activities." After his statement caused concern in Europe, Truman met on 4 December with UK Prime Minister and Commonwealth of Nations, Commonwealth spokesman Clement Attlee, French Premier René Pleven, and French Foreign Minister Robert Schuman to discuss their worries about atomic warfare and its likely continental expansion. The U.S.' forgoing atomic warfare was not because of "a disinclination by the Soviet Union and People's Republic of China to escalate [the Korean War]", but because UN allies—notably the UK, the Commonwealth, and France—were concerned about a geopolitics, geopolitical imbalance rendering NATO defenseless while the U.S. fought China, who then might persuade the Soviet Union to conquer Western Europe. The Joint Chiefs of Staff advised Truman to tell Attlee that the U.S. would use nuclear weapons only if necessary to protect an evacuation of UN troops, or to prevent a "major military disaster". On 6 December after the Chinese intervention repelled the UN armies from northern North Korea, General J. Lawton Collins (Army Chief of Staff), General MacArthur, Admiral C. Turner Joy, General George E. Stratemeyer and staff officers Major General Doyle Overton Hickey, Doyle Hickey, Major General Charles A. Willoughby and Major General Edwin Kennedy WEdwin K. Wright met in Tokyo to plan strategy countering the Chinese intervention; they considered three potential atomic warfare scenarios encompassing the next weeks and months of warfare. * In the first scenario: If the PVA continued attacking in full and the UN Command was forbidden to blockade and bomb China, and without Taiwanese reinforcements, and without an increase in U.S. forces until April 1951 (four National Guard divisions were due to arrive), then atomic bombs might be used in North Korea. * In the second scenario: If the PVA continued full attacks and the UN Command blockaded China and had effective aerial reconnaissance and bombing of the Chinese interior, and the Taiwanese soldiers were maximally exploited, and tactical atomic bombing was to hand, then the UN forces could hold positions deep in North Korea. * In the third scenario: if China agreed not to cross the 38th parallel border, MacArthur would recommend UN acceptance of an armistice disallowing PVA and KPA troops south of the parallel, and requiring PVA and KPA guerrillas to withdraw northwards. The Eighth Army would remain to protect the Seoul–Incheon area, while X Corps would retreat to Pusan. A UN commission should supervise implementation of the armistice. Both the Pentagon and the State Department were cautious about using nuclear weapons because of the risk of general war with China and the diplomatic ramifications. Truman and his senior advisors agreed and never seriously considered using them in early December 1950 despite the poor military situation in Korea. In 1951, the U.S. escalated closest to atomic warfare in Korea. Because China deployed new armies to the Sino-Korean frontier, ground crews at the Kadena Air Base, Okinawa Prefecture, Okinawa, assembled atomic bombs for Korean warfare, "lacking only the essential pit nuclear cores." In October 1951, the United States effected Operation Hudson Harbor to establish a nuclear weapons capability. USAF B-29 bombers practiced individual bombing runs from Okinawa to North Korea (using dummy nuclear or conventional bombs), coordinated from Yokota Air Base in east-central Japan. Hudson Harbor tested "actual functioning of all activities which would be involved in an atomic strike, including weapons assembly and testing, leading, [and] ground control of bomb aiming". The bombing run data indicated that atomic bombs would be tactically ineffective against massed infantry, because the "timely identification of large masses of enemy troops was extremely rare". Ridgway was authorized to use nuclear weapons if a major air attack originated from outside Korea. An envoy was sent to Hong Kong to deliver a warning to China. The message likely caused Chinese leaders to be more cautious about potential U.S. use of nuclear weapons, but whether they learned about the B-29 deployment is unclear, and the failure of the two major Chinese offensives that month likely was what caused them to shift to a defensive strategy in Korea. The B-29s returned to the United States in June. Despite the greater destructive power that atomic weapons would bring to the war, their effects on determining the war's outcome would have likely been minimal. Tactically, given the dispersed nature of PVA/KPA forces, the relatively primitive infrastructure for staging and logistics centers, and the small number of bombs available (most would have been conserved for use against the Soviets), atomic attacks would have limited effects against the ability of China to mobilize and move forces. Strategically, attacking Chinese cities to destroy civilian industry and infrastructure would cause the immediate dispersion of the leadership away from such areas and give propaganda value for the communists to galvanize the support of Chinese civilians. Since the Soviets were not expected to intervene with their few primitive atomic weapons on China or North Korea's behalf, the threat of a possible nuclear exchange was unimportant in the decision not to deploy atomic bombs; their use offered little operational advantage and would undesirably lower the "threshold" for using atomic weapons against non-nuclear states in future conflicts. When Eisenhower succeeded Truman in early 1953, he was similarly cautious about using nuclear weapons in Korea. The administration prepared contingency plans to use them against China, but like Truman, he feared that doing so would result in Soviet attacks on Japan. The war ended as it began, without U.S. nuclear weapons deployed near battle.


Aftermath


North Korea

As a result of the war, "North Korea had been virtually destroyed as an industrial society". After the armistice, Kim Il Sung requested Soviet economic and industrial assistance. In September 1953, the Soviet government agreed to "cancel or postpone repayment for all ... outstanding debts", and promised to grant North Korea one billion rubles in monetary aid, industrial equipment and consumer goods. Eastern European members of the Soviet Bloc also contributed with "logistical support, technical aid, [and] medical supplies". China canceled North Korea's war debts, provided 800 million Chinese yuan, yuan, promised trade cooperation and sent in thousands of troops to rebuild damaged infrastructure. Contemporary North Korea remains underdeveloped and continues to be a Totalitarianism, totalitarian dictatorship since the end of the war, with an elaborate North Korean cult of personality, cult of personality around the Kim family (North Korea), Kim dynasty. Present-day North Korea follows ''Songun'', or "military-first" policy and has the List of countries by number of troops, highest number of military and paramilitary personnel in the world, with 7,769,000 active, reserve and paramilitary personnel, or approximately of its population. Its active-duty army of 1.28 million is the fourth largest in the world, after China, the United States and India; consisting of of its population. North Korea North Korea and weapons of mass destruction, possesses nuclear weapons. A 2014 UN inquiry into abuses of human rights in North Korea concluded that, "the gravity, scale and nature of these violations reveal a state that does not have any parallel in the contemporary world," with Amnesty International and Human Rights Watch holding similar views.


South Korea

Postwar recovery was different in the two Koreas. South Korea, which started from a far lower industrial base than North Korea (the latter contained 80% of Korea's heavy industry in 1945), stagnated in the first postwar decade. In 1953, South Korea and the United States signed a Mutual Defense Treaty (United States–South Korea), Mutual Defense Treaty. South Korean Anti-American sentiment in Korea, anti-Americanism after the war was fueled by the presence and behavior of United States Forces Korea military personnel and U.S. support for Park's authoritarian regime, a fact still evident during the country's democratic transition in the 1980s. However, anti-Americanism has declined significantly in South Korea in recent years, from 46% favorable in 2003 to 74% favorable in 2011, making South Korea one of the most pro-U.S. countries. A large number of Amerasian, mixed-race "GI babies" (offspring of U.S. and other UN soldiers and Korean women) were filling up the country's orphanages. Because Korean traditional society places significant weight on paternal family ties, bloodlines, and purity of race, children of mixed race or those without fathers are not easily accepted in South Korean society. International adoption of Korean children began in 1954. The U.S. Immigration Act of 1952 legalized the naturalization of non-Blacks and non-Whites as U.S. citizens and made possible the entry of military spouses and children from South Korea. With the passage of the Immigration Act of 1965, which substantially changed U.S. immigration policy toward non-Europeans, Korean American, Koreans became one of the fastest-growing Asian American, Asian groups in the United States.


Communism

Mao Zedong's decision to take on the United States was a direct attempt to confront what the communist bloc viewed as the strongest anti-communist power in the world, undertaken at a time when the Chinese communist regime was still consolidating its own power. Mao supported intervention not to save North Korea, but because he believed that a military conflict with the U.S. was inevitable after the U.S. entered the war, and to appease the Soviet Union to secure military dispensation and achieve Mao's goal of making China a major world military power. Mao was equally ambitious in improving his own prestige inside the communist international community. In his later years, Mao believed that Stalin only gained a positive opinion of him after China's entrance into the Korean War. Inside mainland China, the war improved the long-term prestige of Mao, Zhou, and Peng, allowing the Chinese Communist Party to increase its legitimacy while weakening anti-communist dissent. The Chinese government has encouraged the viewpoint that the war was initiated by the United States and South Korea, though ComIntern documents have shown that Mao sought approval from Stalin to enter the war. In Chinese media, the Chinese war effort is considered as an example of China's engaging the strongest power in the world with an underequipped army, forcing it to retreat, and fighting it to a military stalemate. These successes were contrasted with China's Century of humiliation, historical humiliations by Japan and by Western powers over the previous hundred years, highlighting the abilities of the PLA and the Chinese Communist Party. The Korean war cemented China's relationship with the USSR for some time, making it more dependent on the Soviet Union for development aid and technology, while limiting cooperation between China and the US. A high proportion of government expenditures were needed for the war and this slowed China's reconstruction. The most significant negative long-term consequence of the war for China was that it led the United States to guarantee the safety of Chiang Kaishek's regime in Taiwan, effectively ensuring that Taiwan would remain outside of PRC control through the present day. Anti-Americanism, Anti-U.S. sentiments, which were already a significant factor during the Chinese Civil War, were ingrained into Chinese culture during the communist propaganda campaigns of the Korean War. The Korean War affected other participant combatants. Turkey, for example, entered NATO in 1952, and the foundation was laid for bilateral diplomatic and trade South Korea–Turkey relations, relations with South Korea. The war also played a role in the Exodus of Turks from Bulgaria (1950–1951), refugee crisis in Turkey in 1950–1951.


See also

* Korean War in popular culture * Korean–American Volunteer Group * List of books about the Korean War * List of Korean War Medal of Honor recipients * List of Korean War weapons * List of military equipment used in the Korean War * Partisans in the Korean War * Transfer of People's Volunteer Army soldiers' remains from South Korea to China * United Nations Command Military Armistice Commission, UN Command Military Armistice Commission operating from 1953 to the present * United Nations Commission for the Unification and Rehabilitation of Korea, UN Commission for the Unification and Rehabilitation of Korea * United Nations Temporary Commission on Korea, UN Temporary Commission on Korea * United Service Organizations


War memorials

* Korean War Memorial Wall (Canada), Korean War Memorial Wall, Brampton, Ontario * Korean War Veterans Memorial, Washington, D.C. * Memorial of the War to Resist US Aggression and Aid Korea, Dandong, China * National War Memorial (New Zealand) * Philadelphia Korean War Memorial * United Nations Memorial Cemetery, Busan * w:tr:Kore'de Savaşan Türkler Anıtı, Memorial of Turks Who Fought in Korea, Ankara, Turkey * Victorious War Museum, Pyongyang, North Korea * War Memorial of Korea, Yongsan-dong, Seoul, Yongsan-dong, Yongsan District, Seoul, South Korea


Notes


References


Citations


Bibliography

* * * * * * * * * * * * * * * * * Lin, L., et al. "Whose history? An analysis of the Korean war in history textbooks from the United States, South Korea, Japan, and China". ''Social Studies'' 100.5 (2009): 222–232
online
* * Matray, James I., and Donald W. Boose Jr, eds. ''The Ashgate research companion to the Korean War'' (2014
excerpt
; covers historiography * Matray, James I. "Conflicts in Korea" in Daniel S. Margolies, ed. ''A Companion to Harry S. Truman'' (2012) pp 498–531; emphasis on historiography. * * * * * * * * * * * * * *


External links

* Records o
the United Nations Commission for the Unification and Rehabilitation of Korea (UNCURK) (1950–1973)
at the United Nations Archives


Historical



* [https://www.imhc.mil.kr/user/imhc/upload/pblictn/PBLICTNEBOOK_202303310234112240.pdf THE KOREAN WAR (1) - ROK Ministry of National Defense Institute for Military History, 1997 (PDF)]
THE KOREAN WAR (2) - ROK Ministry of National Defense Institute for Military History, 1998 (E-BOOK)

THE KOREAN WAR (2) - ROK Ministry of National Defense Institute for Military History, 1999 (PDF)


* [https://www.imhc.mil.kr/user/imhc/upload/pblictn/PBLICTNEBOOK_202303310233258330.pdf THE KOREAN WAR (3) - ROK Ministry of National Defense Institute for Military History, 1998 (PDF)]
History of the Just Fatherland Liberation War of the Korean People (PDF)
The Research Institute of History, Academy of Sciences of the Democratic People's Republic of Korea
Anniversary of the Korean War Armistice: Truman on Acheson's Crucial Role in Going to War
Shapell Manuscript Foundation

* [https://www.wilsoncenter.org/program/north-korea-international-documentation-project North Korea International Documentation Project]
Grand Valley State University Veteran's History Project digital collection


 – four testimonials in ''The New York Times''
Collection of Books and Research Materials on the Korean War
an online collection of the United States Army Center of Military History
Korean War, US Army Signal Corps Photograph Collection
U.S. Army Heritage and Education Center, Carlisle, Pennsylvania

*


Media


West Point Atlas of the Korean War

The Korean War You Never Knew
nbsp;– slideshows by ''Life (magazine), Life'' magazine
U.S. Army Korea Media Center official Korean War online image archive

Rare pictures of the Korean War from the U.S. Library of Congress and National Archives


* [http://www.britishpathe.com/workspace.php?id=32&display=listBritish Pathé] Online newsreel archive featuring films on the war
CBC Digital Archives – Forgotten Heroes: Canada and the Korean War

Uncertain Enemies: Soviet Pilots in the Korean War
. ''Air Power History.'' (Spring 1997). 44, 1, 32–45.


Organizations










Memorials


Korean Children's War Memorial


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