was a

colonel Colonel (abbreviated as Col., Col or COL) is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations. In the 17th, 18th and 19th centuries, a colonel was typically in charge of ...

in the

Imperial Japanese Army The was the official ground-based armed force of the Empire of Japan from 1868 to 1945. It was controlled by the Imperial Japanese Army General Staff Office and the Ministry of the Army, both of which were nominally subordinate to the Emperor o ...

and a commander of Japanese troops during the strategically significant

Guadalcanal campaign The Guadalcanal campaign, also known as the Battle of Guadalcanal and codenamed Operation Watchtower by American forces, was a military campaign fought between 7 August 1942 and 9 February 1943 on and around the island of Guadalcanal in th ...

in the

Pacific theater The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. He was posthumously promoted to

major general Major general (abbreviated MG, maj. gen. and similar) is a military rank used in many countries. It is derived from the older rank of sergeant major general. The disappearance of the "sergeant" in the title explains the apparent confusion of a ...

Biography

Oka was a native of

Wakayama Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Wakayama Prefecture has a population of 944,320 () and has a geographic area of . Wakayama Prefecture borders Osaka Prefecture to the north, and Mie Prefecture and Nara Prefecture ...

and a graduate of the 24th class of the

Imperial Japanese Army Academy The was the principal officer's training school for the Imperial Japanese Army. The programme consisted of a junior course for graduates of local army cadet schools and for those who had completed four years of middle school, and a senior course f ...

in 1912. As a lieutenant, he served in the IJA 7th Infantry Regiment, followed by the IJA 77th Infantry Regiment. In 1924, he received specialized training in

armored warfare Armoured warfare or armored warfare (mechanized forces, armoured forces or armored forces) (American English; see spelling differences), is the use of armored fighting vehicles in modern warfare. It is a major component of modern methods of ...

, but remained in the

infantry Infantry is a military specialization which engages in ground combat on foot. Infantry generally consists of light infantry, mountain infantry, motorized infantry & mechanized infantry, airborne infantry, air assault infantry, and marine i ...

all of his career. He was promoted to major in 1930,

lieutenant colonel Lieutenant colonel ( , ) is a rank of commissioned officers in the armies, most marine forces and some air forces of the world, above a major and below a colonel. Several police forces in the United States use the rank of lieutenant colone ...

in 1935 and

in March 1939. In June 1939, Oka became commander of the 4th sector of the 8th Border Patrol Force under the

Kwantung Army ''Kantō-gun'' , image = Kwantung Army Headquarters.JPG , image_size = 300px , caption = Kwantung Army headquarters in Hsinking, Manchukuo , dates = April ...

guarding the

Manchukuo Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of (Great) Manchuria after 1934, was a puppet state of the Empire of Japan in Northeast China, Manchuria from 1932 until 1945. It was founded as a republic in 1932 afte ...

border against the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...

. In June 1940, he was assigned command of the IJA 124th Infantry Regiment, which participated in combat operations in the

Second Sino-Japanese War The Second Sino-Japanese War (1937–1945) or War of Resistance (Chinese term) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific Th ...

. He was then scouted by General

Kiyotake Kawaguchi was a general in the Imperial Japanese Army during World War II. Biography A native of Kōchi Prefecture, Kiyotake graduated from the 26th class of the Imperial Japanese Army Academy in 1914, and from the 34th class of the Army War College (Japan ...

for the proposed invasion of

Port Moresby (; Tok Pisin: ''Pot Mosbi''), also referred to as Pom City or simply Moresby, is the capital and largest city of Papua New Guinea. It is one of the largest cities in the southwestern Pacific (along with Jayapura) outside of Australia and New Z ...

New Guinea New Guinea (; Hiri Motu Hiri Motu, also known as Police Motu, Pidgin Motu, or just Hiri, is a language of Papua New Guinea, which is spoken in surrounding areas of Port Moresby (Capital of Papua New Guinea). It is a simplified version of ...

and reassigned to the southwest Pacific front in 1942, landing on

Guadalcanal Guadalcanal (; indigenous name: ''Isatabu'') is the principal island in Guadalcanal Province of Solomon Islands, located in the south-western Pacific, northeast of Australia. It is the largest island in the Solomon Islands by area, and the seco ...

together with the forces commanded by Colonel

Kiyonao Ichiki was an officer in the Japanese Imperial Army in World War II. Ichiki commanded the 28th Infantry Regiment "Ichiki detachment" in the Battle of the Tenaru. The regiment was disastrously defeated by the 1st Marine Regiment and of the 917 soldiers ...

. Oka commanded a portion of Japanese troops from the 35th Infantry Brigade in a losing effort during the

Battle of Edson's Ridge The Battle of Edson's Ridge, also known as the Battle of the Bloody Ridge, Battle of Raiders Ridge, and Battle of the Ridge, was a land battle of the Pacific campaign of World War II between Imperial Japanese Army and Allied (mainly United St ...

in September, 1942. He later successfully defended the

Matanikau River The Matanikau River of Guadalcanal, Solomon Islands, is located in the northwest part of the island. During the World War II Guadalcanal campaign, several significant engagements occurred between United States and Japanese forces near the river. ...

area during the September, 1942 Matanikau action. During the

Battle for Henderson Field The Battle for Henderson Field, also known as the Battle of Guadalcanal or Battle of Lunga Point by the Japanese, took place from 23 to 26 October 1942 on and around Guadalcanal in the Solomon Islands. The battle was a land, sea, and air battle ...

, he led the 1,200 troops of the 124th Infantry Regiment across the Matanikau and attacked

U.S. Marine The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through com ...

defenses early on October 26, 1942, but his attack was thrown back with heavy losses to his men, contributing to the overall decisive Japanese defeat in this battle. At the

Battle of Mount Austen, the Galloping Horse, and the Sea Horse The Battle of Mount Austen, the Galloping Horse, and the Sea Horse, part of which is sometimes called the Battle of the Gifu, took place from 15 December 1942 to 23 January 1943 and was primarily an engagement between United States and Imperia ...

in January 1943, Oka and the 1st and 3rd Battalions from the 124th unsuccessfully attempted to defend a terrain feature called the Sea Horse from American attacks. After losing possession of the feature and surrounding areas, Oka and his surviving troops escaped to friendly lines. Japanese records indicate that he was killed soon after this, but some sources suggest he may have been evacuated with the rest of the Japanese forces during

Operation Ke was the largely successful withdrawal of Japanese forces from Guadalcanal, concluding the Guadalcanal Campaign of . The operation took place between 14 January and 7 February 1943, and involved both Imperial Japanese Army (IJA) and Imperial ...

and survived the campaign. He was posthumously promoted to the rank of

References

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External links

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Footnotes

{{DEFAULTSORT:Oka, Akinosuke 1890 births 1943 deaths People from Wakayama Prefecture Japanese military personnel of World War II Japanese military personnel killed in World War II Japanese generals