Battle of Edson's Ridge
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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 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 ...
between
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and
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(mainly
United States Marine Corps 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 combi ...
) ground forces. It took place from 12–14 September 1942, 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 ...
in the
Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capita ...
, and was the second of three separate major Japanese ground offensives during the
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 battle, U.S. Marines, under the overall command of U.S.
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 ...
Alexander Vandegrift General Alexander Archer Vandegrift, USMC (March 13, 1887 – May 8, 1973) was a United States Marine Corps four-star general. During World War II, he commanded the 1st Marine Division to victory in its first ground offensive of the war, the Bat ...
, repulsed an attack by the Japanese 35th Infantry Brigade, under the command of Japanese Major 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 ...
. The Marines were defending the Lunga perimeter that guarded Henderson Field on Guadalcanal, which was captured from the Japanese by the Allies in landings on Guadalcanal on 7 August 1942. Kawaguchi's unit was sent to Guadalcanal in response to the Allied landings with the mission of recapturing the airfield and driving the Allied forces from the island. Underestimating the strength of Allied forces on Guadalcanal—about 12,000 men—Kawaguchi's 6,000 soldiers conducted several nighttime
frontal assault The military tactic of frontal assault is a direct, full-force attack on the front line of an enemy force, rather than to the flanks or rear of the enemy. It allows for a quick and decisive victory, but at the cost of subjecting the attackers to ...
s on the U.S. defenses. The main Japanese assault occurred around Lunga ridge south of Henderson Field, manned by troops from several U.S. Marine Corps units, primarily troops from the 1st Raider and 1st Parachute
Battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s under U.S. Marine Corps
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 ...
Merritt A. Edson Major General Merritt Austin Edson, Sr. (April 25, 1897 – August 14, 1955), known as "Red Mike", was a general in the United States Marine Corps. Among the decorations he received were the Medal of Honor, two Navy Crosses, the Silver Star, ...
. Although the Marine defenses were almost overrun, Kawaguchi's attack was ultimately defeated, with heavy losses for the Japanese. Because of the key participation by Edson's unit in defending the ridge, the ridge was commonly referred to as "Edson's" ridge in historical accounts of the battle in
Western Western may refer to: Places *Western, Nebraska, a village in the US *Western, New York, a town in the US *Western Creek, Tasmania, a locality in Australia *Western Junction, Tasmania, a locality in Australia *Western world, countries that id ...
sources. After Edson's Ridge, the Japanese continued to send troops to Guadalcanal for further attempts to retake Henderson Field, affecting Japanese offensive operations in other areas of the South Pacific.


Background


Guadalcanal campaign

On 7 August 1942, Allied forces (primarily U.S.) landed on Guadalcanal,
Tulagi Tulagi, less commonly known as Tulaghi, is a small island——in Solomon Islands, just off the south coast of Ngella Sule. The town of the same name on the island (pop. 1,750) was the capital of the British Solomon Islands Protectorate from 18 ...
, and Florida Islands in the
Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capita ...
. The landings on the islands were meant to deny their use by the Japanese as bases for threatening the
supply Supply may refer to: *The amount of a resource that is available **Supply (economics), the amount of a product which is available to customers **Materiel, the goods and equipment for a military unit to fulfill its mission *Supply, as in confidenc ...
routes between the U.S. and
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. They were also intended to secure the islands as starting points for a
campaign Campaign or The Campaign may refer to: Types of campaigns * Campaign, in agriculture, the period during which sugar beets are harvested and processed *Advertising campaign, a series of advertisement messages that share a single idea and theme * Bl ...
to neutralize the major Japanese base at
Rabaul Rabaul () is a township in the East New Britain province of Papua New Guinea, on the island of New Britain. It lies about 600 kilometres to the east of the island of New Guinea. Rabaul was the provincial capital and most important settlement in ...
and support the Allied
New Guinea campaign The New Guinea campaign of the Pacific War lasted from January 1942 until the end of the war in August 1945. During the initial phase in early 1942, the Empire of Japan invaded the Australian-administered Mandated Territory of New Guinea (23 Jan ...
. The landings initiated the six-month-long Guadalcanal campaign. Taking the Japanese by surprise, by nightfall on 8 August the Allied landing forces had secured Tulagi and nearby small islands, as well as an airfield under construction at Lunga Point () on the north shore of the island of Guadalcanal, east of the present day capital of
Honiara Honiara () is the capital and largest city of Solomon Islands, situated on the northwestern coast of Guadalcanal. , it had a population of 92,344 people. The city is served by Honiara International Airport and the seaport of Point Cruz, and lie ...
. By 9 August, 10,900 troops from
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 ...
Alexander Vandegrift General Alexander Archer Vandegrift, USMC (March 13, 1887 – May 8, 1973) was a United States Marine Corps four-star general. During World War II, he commanded the 1st Marine Division to victory in its first ground offensive of the war, the Bat ...
's 1st Marine Division were on Guadalcanal, occupying a loose perimeter around the Lunga Point area. On 12 August, the airfield was named Henderson Field after Major Lofton Henderson, a Marine aviator who had been killed at the
Battle of Midway The Battle of Midway was a major naval battle in the Pacific Theater of World War II that took place on 4–7 June 1942, six months after Japan's attack on Pearl Harbor and one month after the Battle of the Coral Sea. The U.S. Navy under Adm ...
. The Allied aircraft and pilots that subsequently operated out of Henderson Field were called the " Cactus Air Force" after the Allied code name for Guadalcanal. In response to the Allied landings on Guadalcanal, the Japanese
Imperial General Headquarters The was part of the Supreme War Council and was established in 1893 to coordinate efforts between the Imperial Japanese Army and Imperial Japanese Navy during wartime. In terms of function, it was approximately equivalent to the United States ...
assigned the Imperial Japanese Army's 17th Army—a
corps Corps (; plural ''corps'' ; from French , from the Latin "body") is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies great ...
-sized command based at Rabaul (), under the command of Lieutenant-General
Harukichi Hyakutake was a general in the Japanese Imperial Army in World War II. He is sometimes referred to as Haruyoshi Hyakutake or Seikichi Hyakutake. His elder brothers Saburō Hyakutake and Gengo Hyakutake were admirals in the Imperial Japanese Navy. Biograph ...
—with the task of retaking Guadalcanal from Allied forces. The 17th Army, already heavily involved with the Japanese campaign in
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 ...
, had only a few units available to send to the southern Solomons area. Of these units, the 35th Infantry Brigade (under Major General Kiyotake Kawaguchi) was at
Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the Caro ...
, the 4th (Aoba) Infantry Regiment was in the
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, and the 28th Infantry Regiment (under
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 ...
Kiyonao Ichiki) was embarked on transport ships near
Guam Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...
. The different units began to move toward Guadalcanal immediately; Ichiki's regiment, the closest, arrived first. The "First Element" of Ichiki's unit—consisting of about 917 soldiers—landed from destroyers at Taivu Point (), about east of the Lunga perimeter, on 19 August. Underestimating the strength of Allied forces on Guadalcanal, Ichiki's First Element conducted a nighttime frontal assault on Marine positions at Alligator Creek on the east side of the Lunga perimeter in the early morning hours of 21 August. Ichiki's assault was repulsed with devastating losses for the attackers in what became known as the
Battle of the Tenaru The Battle of the Tenaru, sometimes called the Battle of the Ilu River or the Battle of Alligator Creek, was a land battle between the Imperial Japanese Army and Allied ground forces that took place on 21 August 1942, on the island of Guada ...
: all but 128 of the 917 men of the First Element (including Ichiki himself) were killed in the battle. The survivors returned to Taivu Point, notified 17th Army headquarters of their defeat in the battle and awaited further reinforcements and orders from Rabaul. By 23 August, Kawaguchi's unit had reached Truk and was loaded onto slow transport ships for the rest of the trip to Guadalcanal. Because of the damage caused by Allied air attack to a separate troop convoy during the
Battle of the Eastern Solomons The naval Battle of the Eastern Solomons (also known as the Battle of the Stewart Islands and, in Japanese sources, as the Second Battle of the Solomon Sea) took place on 24–25 August 1942, and was the third carrier battle of the Pacific ca ...
, the Japanese decided not to deliver Kawaguchi's troops to Guadalcanal by slow transport ship; instead, the ships carrying Kawaguchi's soldiers were sent to Rabaul. From there, the Japanese planned to deliver Kawaguchi's men to Guadalcanal by destroyers, staging through a Japanese naval base in the
Shortland Islands The Shortland Islands is an archipelago of Western Province, Solomon Islands, at . The island group lies in the extreme north-west of the country's territory, close to the south-east edge of Bougainville Island, Papua New Guinea. The largest isl ...
. The Japanese destroyers were usually able to make the round trip down "The Slot" to Guadalcanal and back in a single night, minimizing their exposure to Allied air attack. However, most of the soldiers' heavy equipment and supplies, such as heavy artillery, vehicles, and much food and ammunition, could not be taken to Guadalcanal with them. These high-speed destroyer runs to Guadalcanal, which occurred throughout the campaign, were later called the "
Tokyo Express The Tokyo Express was the name given by Allied forces to the use of Imperial Japanese Navy ships at night to deliver personnel, supplies, and equipment to Japanese forces operating in and around New Guinea and the Solomon Islands during the ...
" by Allied forces and "Rat Transportation" by the Japanese. The Japanese controlled the seas around the Solomon Islands during the nighttime and were not challenged by the Allies. However, any Japanese ship remaining within the range of the aircraft at Henderson Field in daylight was in great danger from air attacks. This "curious tactical situation" held for several months.


Troop movement

On 28 August 600 of Kawaguchi's troops were loaded onto the destroyers , , , and , designated Destroyer Division 20 (DD20). Because of a shortage of fuel, DD20 could not make the entire round trip to Guadalcanal at high speed in one night, and had to start the trip earlier in the day so that they could complete the trip by the next morning at a slower speed which conserved fuel. At 18:05 that day, 11 U.S.
dive bomber A dive bomber is a bomber aircraft that dives directly at its targets in order to provide greater accuracy for the bomb it drops. Diving towards the target simplifies the bomb's trajectory and allows the pilot to keep visual contact througho ...
s from
VMSB-232 Marine Fighter Attack Squadron 232 (VMFA-232) is a United States Marine Corps F/A-18 Hornet squadron. Nicknamed the "Red Devils", the squadron is based at Marine Corps Air Station Miramar, California and falls under the command of Marine Aircraft ...
, under the command of Lt. Col. Richard Mangrum, flew from Henderson Field and located and attacked DD20 about north of Guadalcanal, sinking ''Asagiri'' and heavily damaging ''Yugiri'' and ''Shirakumo''. ''Amagiri'' took ''Shirakumo'' in tow and the three destroyers returned to the Shortlands without completing their mission. The attack on DD20 killed 62 of Kawaguchi's soldiers and 94 crew members. Subsequent "Express" runs were more successful. Between 29 August and 4 September, various Japanese light
cruiser A cruiser is a type of warship. Modern cruisers are generally the largest ships in a fleet after aircraft carriers and amphibious assault ships, and can usually perform several roles. The term "cruiser", which has been in use for several hu ...
s, destroyers, and
patrol boat A patrol boat (also referred to as a patrol craft, patrol ship, or patrol vessel) is a relatively small naval vessel generally designed for coastal defence, border security, or law enforcement. There are many designs for patrol boats, and the ...
s were able to land almost 5,000 troops at Taivu Point, including all of the 35th Infantry Brigade, one battalion of the Aoba Regiment, and the rest of Ichiki's regiment. General Kawaguchi, who landed at Taivu Point on 31 August Express run, was placed in command of all the Japanese troops on Guadalcanal. On the night of 4/5 September, as three of the Express destroyers—, , and —prepared to shell Henderson Field after landing their troops, they detected and sank two U.S. ships in the vicinity, the small, old destroyer transports (called "APDs" by the U.S. Marines) and that were used to shuttle Allied troops around the Guadalcanal/Tulagi area. In spite of the successes of the destroyer runs, Kawaguchi insisted that as many soldiers of his brigade as possible be delivered to Guadalcanal by slow barges. Therefore, a convoy carrying 1,100 of Kawaguchi's troops and heavy equipment in 61 barges, mainly from the 2nd Battalion, 124th Infantry Regiment under the command of Colonel Akinosuka Oka, departed the northern coast of Santa Isabel Island on 2 September. On 4–5 September, aircraft from Henderson Field attacked the barge convoy, killing about 90 of the soldiers in the barges and destroying much of the unit's heavy equipment. Most of the remaining 1,000 troops were able to land near Kamimbo (), west of the Lunga perimeter over the next few days. By 7 September, Kawaguchi had 5,200 troops at Taivu Point and 1,000 west of the Lunga perimeter. Kawaguchi was confident enough that he could defeat the Allied forces facing him that he declined an offer from the 17th Army for delivery of one more infantry battalion to augment his forces. Kawaguchi believed that there were only about 2,000 U.S. Marines on Guadalcanal. During this time, Vandegrift continued to direct efforts to strengthen and improve the defenses of the Lunga perimeter. Between 21 August and 3 September, he relocated three Marine battalions—including the 1st Raider Battalion, under U.S. Lieutenant Colonel
Merritt A. Edson Major General Merritt Austin Edson, Sr. (April 25, 1897 – August 14, 1955), known as "Red Mike", was a general in the United States Marine Corps. Among the decorations he received were the Medal of Honor, two Navy Crosses, the Silver Star, ...
(Edson's Raiders), and the 1st Parachute Battalion—from Tulagi and
Gavutu Gavutu is a small islet in the Central Province of the Solomon Islands, some in length. It is one of the Nggela Islands. History The first recorded sighting by Europeans was by the Spanish expedition of Álvaro de Mendaña on 16 April 1568. Mo ...
to Guadalcanal. These units added about 1,500 troops to Vandegrift's original 11,000 men defending Henderson Field. The 1st Parachute battalion, which had suffered heavy casualties in the Battle of Tulagi and Gavutu-Tanambogo in August, was placed under Edson's command.


Battle


Prelude

Kawaguchi set the date for his attack on the Lunga perimeter for 12 September and began marching his forces west from Taivu towards Lunga Point on 5 September. He radioed 17th Army and requested that it carry out air strikes on Henderson Field beginning on 9 September, and that naval warships be stationed off Lunga Point on 12 September to "destroy any Americans who attempted to flee from the island." On 7 September, Kawaguchi issued his attack plan to "rout and annihilate the enemy in the vicinity of the Guadalcanal Island airfield." Kawaguchi's plan called for his forces to split into three, approach the Lunga perimeter inland, and launch a surprise night attack. Oka's force would attack the perimeter from the west while Ichiki's Second Echelon—renamed the Kuma Battalion—would attack from the east. The main attack would be by Kawaguchi's "Center Body", numbering 3,000 men in three battalions, from the south of the Lunga perimeter. By 7 September, most of Kawaguchi's troops had started marching from Taivu towards Lunga Point along the coastline. About 250 Japanese troops remained behind to guard the brigade's supply base at Taivu. Meanwhile, native island scouts—directed by British government official and officer in the
British Solomon Islands Protectorate Defence Force The British Solomon Islands Protectorate Defence Force (BSIPDF) was a locally recruited military unit in the British Solomon Islands Protectorate during World War II. It was created following the outbreak of war with Japan in 1942 and disbanded ...
,
Martin Clemens Major Warren Frederick Martin Clemens (17 April 1915 – 31 May 2009) was a British colonial administrator and soldier. In late 1941 and early 1942, while serving as a District Officer in the Solomon Islands, he helped prepare the area for event ...
—told the Marines of Japanese troops at Taivu, near the village of Tasimboko, about east of Lunga. Edson launched a raid against the Japanese troops at Taivu. Destroyer transports and and two patrol boats took 813 of Edson's men to Taivu in two trips. Edson and his first wave of 501 troops landed at Taivu at 05:20 (local time) on 8 September. Supported by aircraft from Henderson Field and gunfire from the destroyer transports, Edson's men advanced towards Tasimboko village but were slowed by Japanese resistance. At 11:00, the rest of Edson's men landed. With this reinforcement and more support from the Henderson Field aircraft, Edson's force pushed into the village. The Japanese defenders, believing a major landing was underway after observing the concurrent approach of an Allied supply ship convoy heading towards Lunga Point, retreated into the jungle, leaving behind 27 dead. Two Marines were killed. In Tasimboko, Edson's troops discovered the supply base for Kawaguchi's forces, including large stockpiles of food, ammunition and medical supplies, and a
shortwave Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 me ...
radio. The Marines seized documents, equipment and food supplies, destroyed the rest, and returned to the Lunga perimeter at 17:30. The quantities of supplies and intelligence from the captured documents revealed that at least 3,000 Japanese troops were on the island and apparently planning an attack. Edson and Colonel
Gerald Thomas Gerald Thomas (10 December 1920 – 9 November 1993) was an English film director, best known for the long-running ''Carry On'' series of British film comedies. Biography Born in Hull, East Riding of Yorkshire, England, Thomas was educated ...
, Vandegrift's operations officer, believed that the Japanese attack would come at the Lunga Ridge, a narrow, grassy, long, coral ridge () parallel to the Lunga River just south of Henderson Field. The ridge offered a natural avenue of approach to the airfield, commanded the surrounding area and was almost undefended. Edson and Thomas tried to persuade Vandegrift to move forces to defend the ridge, but Vandegrift refused, believing that the Japanese were more likely to attack along the coast. Finally, Thomas convinced Vandegrift that the ridge was a good location for Edson's Raiders to "rest" from their actions of the preceding month. On 11 September, the 840 men of Edson's unit—including the 1st Raiders and the Paramarines—deployed onto and around the ridge and prepared to defend it. Kawaguchi's Center Body of troops ''was'' planning to attack the Lunga perimeter at the ridge, which they called "the centipede" (mukade gata) because of its shape. On 9 September, Kawaguchi's troops left the coast at
Koli Point Koli may refer to: Places * Koli, Finland, a hill in Finland * Koli National Park, a national park in Finland * Koli, Iran (disambiguation), several places in Iran * Koli Airfield, a former airfield in the South Pacific Other uses * Koli peo ...
. Split into four columns, they marched into the jungle towards their predesignated attack points south and southeast of the airfield. Lack of good maps, at least one faulty compass, and thick, almost impenetrable jungle caused the Japanese columns to proceed slowly and zigzag, costing a lot of time. At the same time, Oka's troops approached the Lunga perimeter from the west. Oka had some intelligence on the Marine defenses, extracted from a
U.S. Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
pilot captured on 30 August. During the day of 12 September, Kawaguchi's troops struggled through the jungle toward their assembly points for that night's attacks. Kawaguchi wanted his three Center Body battalions in place by 14:00, but they did not reach their assembly areas until after 22:00. Oka was also delayed in his advance towards the Marine lines in the west. Only the Kuma battalion reported that they were in place on time. Despite the problems in reaching the planned attack positions, Kawaguchi was still confident in his attack plan because a captured U.S. pilot disclosed that the ridge was the weakest part of the Marine defenses. Japanese bombers attacked the ridge during daytime on 11–12 September, causing a few casualties, including two killed.


First night's action

The Americans knew of the approach of the Japanese forces from reports from native scouts and their own patrols, but did not know exactly where or when they would attack. The ridge around which Edson deployed his men consisted of three distinct hillocks. At the southern tip and surrounded on three sides by thick jungle was Hill 80 (so named because it rose above sea level). Six hundred yards north was Hill 123 ( high), the dominant feature on the ridge. The northernmost hillock was unnamed and about high. Edson placed the five companies from the Raider battalion on the west side of the ridge and the three Parachute battalion companies on the east side, holding positions in depth from Hill 80 back to Hill 123. Two of the five Raider companies, "B" and "C", held a line between the ridge, a small, swampy lagoon, and the Lunga River. Machine-gun teams from "E" Company, the heavy weapons company, were scattered throughout the defenses. Edson placed his command post on Hill 123. At 21:30 on 12 September, the Japanese cruiser and three destroyers shelled the Lunga perimeter for 20 minutes and illuminated the ridge with a searchlight. Japanese artillery began shelling the Marine lines, but did little damage. At the same time, scattered groups of Kawaguchi's troops began skirmishing with Marines around the ridge. Kawaguchi's 1st Battalion—led by
Major Major (commandant in certain jurisdictions) is a military rank of commissioned officer status, with corresponding ranks existing in many military forces throughout the world. When used unhyphenated and in conjunction with no other indicators ...
Yukichi Kokusho—attacked the Raiders's "C" company between the lagoon and the Lunga River, overrunning at least one platoon and forcing the Marine company to fall back to the ridge. Kokusho's unit became entangled with troops from Kawaguchi's 3rd Battalion under
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 ...
Kusukichi Watanabe, who were still struggling to reach their attack positions, and the resulting confusion effectively stopped the Japanese attack on the ridge that night. Kawaguchi, who was having trouble locating where he was in relation to the U.S. Marine lines as well as coordinating his troops' attacks, later complained, "Due to the devilish jungle, the brigade was scattered all over and was completely beyond my control. In my whole life I have never felt so disappointed and helpless." Twelve U.S. Marines were killed; Japanese casualties are unknown but perhaps somewhat greater. Although both Oka in the west and the Kuma unit in the east tried to attack the Marine lines that night, they failed to make contact and halted near the Marine lines at dawn. At first light on 13 September, Cactus Air Force aircraft and Marine artillery fired into the area just south of the ridge, forcing any Japanese out in the open to seek cover in the nearby jungle. The Japanese suffered several casualties, including two officers from Watanabe's battalion. At 05:50, Kawaguchi decided to regroup his forces for another attack that night.


Second night's action on the ridge

Expecting the Japanese to attack again that night, Edson directed his troops to improve their defenses on and around the ridge. After a failed attempt by two companies to retake the ground on the Marine right flank lost to Kokusho the night before, Edson repositioned his forces. He pulled his front back about to a line that stretched , starting at the Lunga River and crossing the ridge about south of Hill 123. Around and behind Hill 123 he placed five companies. Any Japanese attackers surmounting Hill 80 would have to advance over of open terrain to close with the Marine positions at Hill 123. With only a few hours to prepare, the Marines were able to construct only rudimentary and shallow fortifications. They were low on ammunition, with one or two
grenades A grenade is an explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A modern hand grenade gene ...
for each Marine. Vandegrift ordered a reserve force consisting of the 2nd Battalion, 5th Marine Regiment (2/5) to move into a position just to the rear of Edson's troops. In addition, a battery of four 105 mm howitzers from the 3rd Battalion, 11th Marine Regiment under Lieutenant Colonel James J. Keating moved to a location from where it could provide direct fire onto the ridge, and a forward artillery observer was placed with Edson's front line units. Late in the afternoon, Edson stepped onto a grenade box and addressed his exhausted troops, saying, Edson's speech "raised the spirits" of the Raiders and helped them prepare mentally for the night ahead. As the sun set on 13 September, Kawaguchi faced Edson's 830 Marines with 3,000 troops of his brigade, plus an assortment of light artillery. The night was pitch black, with no moon. At 21:00, seven Japanese destroyers briefly bombarded the ridge. Kawaguchi's attack began just after nightfall, with Kokusho's battalion assaulting Raider Company B on the Marine right flank, just to the west of the ridge. The force of the assault caused Company B to fall back to Hill 123. Under Marine artillery fire, Kokusho reassembled his men and continued his attack. Without pausing to try to "roll-up" the other nearby Marine units, whose flanks were now unprotected, Kokusho's unit surged forward through the swampy lowlands between the ridge and the Lunga River, heading for the airfield. Kokusho's men came upon a pile of Marine supplies and rations. Not having eaten adequately for a couple of days, they paused to "gorge themselves" on the "C" and "K" rations. Kokusho ordered his men to continue the attack. At about 03:00, he led them against the Marine units around the northern portion of the ridge, just short of the airfield, as well as Hill 123. In the heavy fighting that followed, Kokusho and around 100 of his men were killed, ending that attack. Meanwhile, Kawaguchi's 2nd Battalion, under Major Masao Tamura, assembled for their planned assault against Hill 80 from the jungle south of the ridge. Marine observers spotted Tamura's preparations and called in artillery fire. At about 22:00, a barrage from twelve guns hit Tamura's position. In response, two companies of Tamura's troops—numbering about 320 men—charged up Hill 80 with fixed
bayonet A bayonet (from French ) is a knife, dagger, sword, or spike-shaped weapon designed to fit on the end of the muzzle of a rifle, musket or similar firearm, allowing it to be used as a spear-like weapon.Brayley, Martin, ''Bayonets: An Illustr ...
s behind their own barrage of mortar fire and grenades. Tamura's attack hit Company B of the Marine Parachute battalion and also Raider Company B, pushing the Parachutists off the east side of the ridge into a draw below the ridgeline. To protect the exposed Raider Company B, Edson immediately ordered them to pull back onto Hill 123. At the same time, a Japanese company from Watanabe's battalion infiltrated through a gap between the east side of the ridge and Parachute Company C. Deciding that their positions were now untenable, Parachute Companies B and C climbed onto the ridge and retreated to a position behind Hill 123. In the darkness and confusion of the battle, the retreat quickly became confused and disorganized. A few Marines began yelling that the Japanese were attacking with poison gas, scaring other Marines who no longer possessed their
gas mask A gas mask is a mask used to protect the wearer from inhaling airborne pollutants and toxic gases. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face. Most gas mask ...
s. After arriving behind Hill 123, some of the Marines continued on towards the airfield, repeating the word "withdraw" to anyone within earshot. Other Marines began to follow them. Just at the moment that it appeared that the Marines on the hill were about to break and head for the rear in a rout, Edson, Major
Kenneth D. Bailey Kenneth Dillon Bailey (October 21, 1910 – September 26, 1942) was a United States Marine Corps officer who posthumously received the Medal of Honor for heroic conduct during action during the Battle of Guadalcanal in the Solomon Islands. He ...
from Edson's staff, and other Marine officers appeared and, with "vivid" language, herded the Marines back into defensive positions around Hill 123. As the Marines formed into a horseshoe-shaped line around Hill 123, Tamura's battalion began a series of frontal assaults on the hill, charging up the saddle from Hill 80 and up from below the east side of the ridge. Under the light of parachute flares dropped by at least one Japanese floatplane, the Marines repulsed the first two attacks by Tamura's men. Tamura's troops hoisted a "regimental" gun to the top of Hill 80 in an effort to fire it directly at the Marines. This gun, which "could have turned the tide in favor of the Japanese," however, was disabled by a faulty firing pin. At midnight, during a short lull in the fighting, Edson ordered Parachute Companies B and C to advance from behind Hill 123 to strengthen his left flank. With fixed bayonets, the Paramarines swept forward, killing Japanese soldiers who had overrun the Marine lines and were apparently preparing to roll up the Marine lines from the flank, and took position on the east side of the hill. Marines from other units, as well as members of Edson's command staff, including Major Bailey, took ammunition and grenades under fire to the Marines around Hill 123, who were running critically low. Said Marine participant Captain William J. McKennan, "The Japanese attack was almost constant, like a rain that subsides for a moment and then pours the harder ... When one wave was mowed down—and I mean mowed down—another followed it into death." The Japanese hit Edson's left flank just after the Parachutists took position but were again stopped by Marine rifle, machine-gun, mortar, and grenade fire. Marine 105 mm and 75 mm artillery was also taking a heavy toll on the attacking Japanese. A captured Japanese soldier later said that his unit was "annihilated" by the Marine artillery fire, which only 10% of his company survived. By 04:00, after withstanding several more assaults, some of which resulted in hand-to-hand fighting, and severe sniper fire from all sides, Edson's men were joined by troops from the 2nd Battalion, 5th Marine Regiment, who helped repulse two more Japanese attacks before dawn. Throughout the night, as Kawaguchi's men came close to overrunning the Marine defenses, Edson remained standing about behind the Marine firing line on Hill 123, exhorting his troops and directing their defensive efforts. Marine Captain Tex Smith, who was in position to observe Edson for most of the night, said: "I can say that if there is such a thing as one man holding a battalion together, Edson did it that night. He stood just behind the front lines—stood, when most of us hugged the ground." During the heavy fighting, portions of three Japanese companies, including two from Tamura's and one from Watanabe's battalions, skirted the Marine defenses on the ridge, while suffering heavy losses from Marine gunfire, and reached the edge of "Fighter One", a secondary runway of Henderson Field. A counterattack by the Marine
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stopped one Japanese company's advances and forced it to retreat. The other two companies waited at the edge of the jungle for reinforcements to arrive before attacking into the open area around the airfield. When no reinforcements joined them, both companies went back to their original positions south of the ridge after daybreak. Most of the rest of Watanabe's battalion did not participate in the battle because they lost contact with their commander during the night. As the sun rose on 14 September, pockets of Japanese soldiers remained scattered along both sides of the ridge. But with Tamura's battalion shattered after losing three-quarters of its officers and men, and with heavy casualties to his other attacking units as well, Kawaguchi's assault on the ridge had effectively ended. About 100 Japanese soldiers still remained in the open on the south slope of Hill 80, perhaps preparing for one more charge on Hill 123. At first light, three U.S. Army P-400 Airacobra fighters from the 67th Fighter Squadron at Henderson Field, acting on a request personally delivered by Bailey, strafed the Japanese near Hill 80 and killed most of them, with the few survivors retreating back into the jungle.


Kuma and Oka attacks

As the battle on the ridge took place, Kawaguchi's Kuma and Oka units also attacked the Marine defenses on the east and west sides of the Lunga perimeter. The Kuma battalion—led by Major Takeshi Mizuno—attacked the southeastern sector of the Lunga perimeter, defended by Marines of the 3rd Battalion, 1st Marine Regiment (3/1). Mizuno's attack started around midnight, with one company attacking through Marine artillery fire and engaging in hand-to-hand combat with the Marine defenders before being thrown back. Mizuno was killed in the attack. After daybreak, the Marines, believing that the rest of Mizuno's battalion was still in the area, sent forward six
light tanks A light tank is a tank variant initially designed for rapid movements in and out of combat, to outmaneuver heavier tanks. It is smaller in size with thinner armor and a less powerful main gun, tailored for better tactical mobility and ease of ...
without infantry support to sweep the area in front of the Marine lines; four Japanese anti-tank guns destroyed or disabled three of them, and while some of the tanks' crewmen were able to escape the flames, several of them were bayoneted and killed by the Japanese. One tank tumbled down an embankment into the Tenaru River, drowning its crew. At 23:00 on 14 September, the remnants of the Kuma battalion conducted another attack on the same portion of the Marine lines, but were repulsed. A final "weak" attack by the Kuma unit on the evening of 15 September was also defeated. Oka's unit of about 650 men attacked the Marines at several locations on the west side of the Lunga perimeter. At about 04:00 on 14 September, two Japanese companies attacked positions held by the 3rd Battalion, 5th Marine Regiment (3/5) near the coast and were thrown back with heavy losses. Another Japanese company captured a small ridge somewhat inland but was then pinned down by Marine artillery fire throughout the day and took heavy losses before withdrawing on the evening of 14 September. The rest of Oka's unit failed to find the Marine lines and did not participate in the attack.


Aftermath

At 13:05 on 14 September, Kawaguchi led the survivors of his shattered brigade away from the ridge and deeper into the jungle, where they rested and tended to their wounded all the next day. Kawaguchi's units were then ordered to withdraw west to 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 rive ...
valley to join with Oka's unit, a march over difficult terrain. Kawaguchi's troops began the march on the morning of 16 September. Almost every soldier able to walk had to help carry the wounded. As the march progressed, the exhausted and hungry soldiers, who had eaten their last rations on the morning before their withdrawal, began to discard their heavy equipment and then their rifles. By the time most of them reached Oka's positions at Kokumbona five days later, only half still carried their weapons. The Kuma battalion's survivors, attempting to follow Kawaguchi's Center Body forces, became lost, wandered for three weeks in the jungle, and almost starved to death before finally reaching Kawaguchi's camp. In total, Kawaguchi's lost about 830 men killed in the attack, including 350 in Tamura's battalion, 200 in Kokusho's battalion, 120 in Oka's force, 100 in the Kuma battalion, and 60 in Watanabe's battalion. An unknown number of wounded also died during the withdrawal march to the Matanikau. On and around the ridge, the Marines counted 500 Japanese dead, including 200 on the slopes of Hill 123. The Marines suffered 80 killed between 12 and 14 September. On 17 September, Vandegrift sent two companies from the 1st Battalion, 1st Marine Regiment (1/1) to pursue the retreating Japanese. The Marines were ambushed by two Japanese companies acting as rear-guards for the withdrawal, and one Marine platoon was pinned down as the rest of the Marines retreated. The Marine company commander requested permission to attempt to rescue his platoon but was denied by Vandegrift. By nightfall, the Japanese overran and nearly annihilated the platoon, killing 24 Marines with only a few wounded members of the platoon surviving. On 20 September, a patrol from Edson's Raiders encountered stragglers from Kawaguchi's retreating column and called in artillery fire that killed 19 of them. As the Japanese regrouped west of the Matanikau, the U.S. forces concentrated on shoring up and strengthening their Lunga defenses. On 14 September, Vandegrift moved another battalion, the 3rd Battalion, 2nd Marine Regiment (3/2), from Tulagi to Guadalcanal. On 18 September, an Allied naval convoy delivered 4,157 men from the 3rd Provisional Marine Brigade (the
U.S. 7th Marine Regiment The 7th Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Air Ground Combat Center Twentynine Palms, California. Nicknamed the "Magnificent Seventh", the regiment falls under the command of the 1st M ...
augmented by additional support units) to Guadalcanal. These reinforcements allowed Vandegrift—beginning on 19 September—to establish an unbroken line of defense around the Lunga perimeter. Vandegrift's forces' next significant clashes with the Japanese occurred along 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 rive ...
from 23–27 September and 6–9 October.


Significance

On 15 September, General Hyakutake at Rabaul learned of Kawaguchi's defeat, the Imperial Japanese Army's first defeat involving a unit of this size in the war. The general forwarded the news to the Imperial General Headquarters in Japan. In an emergency session, the top Japanese army and navy command staffs concluded that "Guadalcanal might develop into the decisive battle of the war." The results of the battle began to have a telling strategic impact on Japanese operations in other areas of the Pacific. Hyakutake realized that, in order to send sufficient troops and materiel to defeat the Allied forces on Guadalcanal, he could no longer support the major Japanese offensive on the
Kokoda Track The Kokoda Track or Trail is a single-file foot thoroughfare that runs overland – in a straight line – through the Owen Stanley Range in Papua New Guinea (PNG). The track was the location of the 1942 World War II battle between Japanes ...
in New Guinea. Hyakutake—with the concurrence of the General Headquarters—ordered his troops on New Guinea, who were within of their objective 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 ...
—to withdraw until the Guadalcanal matter was resolved. The Japanese were never able to restart their drive towards Port Moresby; the defeat at Edson's Ridge contributed not only to Japan's defeat in the Guadalcanal campaign, but also to Japan's ultimate defeat throughout the South Pacific. After delivering more forces during the next month the Japanese mounted a major ground offensive on Guadalcanal, led by Hyakutake, in late October 1942 at 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 ...
, but it resulted in an even more decisive defeat for the Japanese. Vandegrift later stated that Kawaguchi's assault on the ridge in September was the only time during the entire campaign he had doubts about the outcome and that had it succeeded, "we would have been in a pretty bad condition." Historian Richard B. Frank adds, "The Japanese never came closer to victory on the island itself than in September 1942, on a ridge thrusting up from the jungle just south of the critical airfield, best known ever after as Bloody Ridge." At
Marine Corps Recruit Depot San Diego Marine Corps Recruit Depot (commonly referred to as MCRD) San Diego is a United States Marine Corps military installation in San Diego, California. It lies between San Diego Bay and Interstate 5, adjacent to San Diego International Airport and t ...
, enlisted recruits finish their training with the 54-hour final exam called "The Crucible". In the final stage, recruits scale a mountain dubbed The Reaper. At the peak, Edson's Medal of Honor citation is displayed. The recruits read and are addressed about it. They are then awarded their Eagle, Globe and Anchor emblems by their senior drill instructors, signifying them as full-fledged Marines. For perspective, the end of training at
Marine Corps Recruit Depot Parris Island Marine Corps Recruit Depot Parris Island (often abbreviated as MCRD PI) is an military installation located within Port Royal, South Carolina, approximately south of Beaufort, the community that is typically associated with the installation. ...
is a hike to the steel scale replica of the Marine Corps War Memorial and a lecture on Raising the flag on Iwo Jima.


Notes


References

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Further reading

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External links

* * – Interactive animation of the battle * * – Web site with many pictures of Guadalcanal battle sites from 1942 and how they look now. * * * {{DEFAULTSORT:Edson's Ridge 1942 in Japan Battles of World War II involving Japan Battles of World War II involving the United States Conflicts in 1942 1942 in the Solomon Islands Battles and operations of World War II involving the Solomon Islands Guadalcanal Campaign Military history of Japan during World War II Pacific Ocean theatre of World War II United States Marine Corps in World War II Land battles of World War II involving the United Kingdom September 1942 events