Battle of Cape Esperance

USS Buchanan (DD-484) steaming near USS Wasp (CV-7) in the South Pacific, circa August 1942, during the Guadalcanal Campaign. Note her Measure 12 (Modified) camouflage scheme.

The Battle of Cape Esperance, also known as the Second Battle of Savo Island and, in Japanese sources, as the Sea Battle of Savo Island, took place on 11–12 October 1942, in the Pacific campaign of World War II between the Imperial Japanese Navy and United States Navy. The naval battle was the second of four major surface engagements during the Guadalcanal campaign and took place at the entrance to the strait between Savo Island and Guadalcanal in the Solomon Islands. Cape Esperance is the northernmost point on Guadalcanal, and the battle took its name from this point.

On the night of 11 October, Japanese naval forces in the Solomon Islands area—under the command of Vice Admiral Gunichi Mikawa—sent a major supply and reinforcement convoy to their forces on Guadalcanal. The convoy consisted of two seaplane tenders and six destroyers and was commanded by Rear Admiral Takatsugu Jojima. At the same time, but in a separate operation, three heavy cruisers and two destroyers—under the command of Rear Admiral Aritomo Gotō—were to bombard the Allied airfield on Guadalcanal (called Henderson Field by the Allies) with the object of destroying Allied aircraft and the airfield’s facilities.

Shortly before midnight on 11 October, a U.S. force of four cruisers and five destroyers—under the command of Rear Admiral Norman Scott—intercepted Gotō’s force as it approached Savo Island near Guadalcanal. Taking the Japanese by surprise, Scott’s warships sank one of Gotō’s cruisers and one of his destroyers, heavily damaged another cruiser, mortally wounded Gotō, and forced the rest of Gotō’s warships to abandon the bombardment mission and retreat. During the exchange of gunfire, one of Scott’s destroyers was sunk and one cruiser and another destroyer were heavily damaged. In the meantime, the Japanese supply convoy successfully completed unloading at Guadalcanal and began its return journey without being discovered by Scott’s force. Later on the morning of 12 October, four Japanese destroyers from the supply convoy turned back to assist Gotō’s retreating, damaged warships. Air attacks by U.S. aircraft from Henderson Field sank two of these destroyers later that day.

As with the preceding naval engagements around Guadalcanal, the strategic outcome was inconclusive because neither the Japanese nor United States navies secured operational control of the waters around Guadalcanal as a result of this action. However, the Battle of Cape Esperance provided a significant morale boost to the U.S. Navy after the failure at the Savo Island.

Background

On 7 August 1942, Allied forces (primarily U.S.) landed on Guadalcanal, Tulagi, and Florida Islands in the Solomon Islands. The objective was to deny the islands to the Japanese as bases for threatening the supply routes between the U.S. and Australia, and secure starting points for a campaign to isolate the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign. The Guadalcanal campaign would last six months.

Taking the Japanese by surprise, by nightfall on 8 August, the Allied forces, mainly consisting of U.S. Marines, had secured Tulagi and nearby small islands, as well as an airfield under construction at Lunga Point on Guadalcanal (later completed and named Henderson Field). Allied aircraft operating out of Henderson became known as the “Cactus Air Force” (CAF) after the Allied codename for Guadalcanal.

In response, the Japanese Imperial General Headquarters assigned the Imperial Japanese Army’s 17th Army—a corps-sized formation headquartered at Rabaul under Lieutenant-General Harukichi Hyakutake—with the task of retaking Guadalcanal. On 19 August, various units of the 17th Army began to arrive on the island.

Due to the threat posed by Allied aircraft, the Japanese were unable to use large, slow transport ships to deliver their troops and supplies to the island, and warships were used instead. These ships—mainly light cruisers and destroyers—were usually able to make the round trip down “the Slot” to Guadalcanal and back in a single night, thereby minimizing their exposure to air attacks. Delivering troops in this manner, however, prevented most of the heavy equipment and supplies, such as heavy artillery, vehicles, and much food and ammunition, from being delivered. In addition, they expended destroyers that were desperately needed for commerce defense. These high-speed runs occurred throughout the campaign and were later called the “Tokyo Express” by the Allies and “Rat Transportation” by the Japanese.

Due to the heavier concentration of Japanese surface combat vessels and their well-positioned logistical base at Simpson Harbor, Rabaul, and their victory at the Battle of Savo Island in early August, the Japanese had established operational control over the waters around Guadalcanal at night. However, any Japanese ship remaining within range—about 200 mi (170 nmi; 320 km)—of American aircraft at Henderson Field, during the daylight hours, was in danger of damaging air attacks. This persisted for the months of August and September, 1942. The presence of Admiral Scott’s task force at Cape Esperance represented the U.S. Navy’s first major attempt to wrest night time operational control of waters around Guadalcanal away from the Japanese.

The first attempt by the Japanese Army to recapture Henderson Field was on 21 August, in the Battle of the Tenaru, and the next, the Battle of Edson’s Ridge, from 12–14 September; both failed.

The Japanese set their next major attempt to recapture Henderson Field for 20 October and moved most of the 2nd and 38th infantry divisions, totaling 17,500 troops, from the Dutch East Indies to Rabaul in preparation for delivering them to Guadalcanal. From 14 September to 9 October, numerous Tokyo Express runs delivered troops from the Japanese 2nd Infantry Division as well as Hyakutake to Guadalcanal. In addition to cruisers and destroyers, some of these runs included the seaplane carrier Nisshin, which delivered heavy equipment to the island including vehicles and heavy artillery other warships could not carry because of space limitations. The Japanese Navy promised to support the Army’s planned offensive by delivering the necessary troops, equipment, and supplies to the island, and by stepping up air attacks on Henderson Field and sending warships to bombard the airfield.

In the meantime, Major General Millard F. Harmon—commander of United States Army forces in the South Pacific—convinced Vice Admiral Robert L. Ghormley—overall commander of Allied forces in the South Pacific—that the marines on Guadalcanal needed to be reinforced immediately if the Allies were to successfully defend the island from the next expected Japanese offensive. Thus, on 8 October, the 2,837 men of the 164th Infantry Regiment from the U.S. Army’s Americal Division boarded ships at New Caledonia for the trip to Guadalcanal with a projected arrival date of 13 October.

To protect the transports carrying the 164th to Guadalcanal, Ghormley ordered Task Force 64 (TF 64), consisting of four cruisers (San Francisco, Boise, Salt Lake City, and Helena) and five destroyers (Farenholt, Duncan, Buchanan, McCalla, and Laffey) under U.S. Rear Admiral Norman Scott, to intercept and combat any Japanese ships approaching Guadalcanal and threatening the convoy. Scott conducted one night battle practice with his ships on 8 October, then took station south of Guadalcanal near Rennell Island on 9 October, to await word of any Japanese naval movement toward the southern Solomons.

Continuing with preparations for the October offensive, Japanese Vice Admiral Gunichi Mikawa’s Eighth Fleet staff, headquartered at Rabaul, scheduled a large and important Tokyo Express supply run for the night of 11 October. Nisshin would be joined by the seaplane carrier Chitose to deliver 728 soldiers, four large howitzers, two field guns, one anti-aircraft gun, and a large assortment of ammunition and other equipment from the Japanese naval bases in the Shortland Islands and at Buin, Bougainville, to Guadalcanal. Six destroyers, five of them carrying troops, would accompany Nisshin and Chitose. The supply convoy—called the “Reinforcement Group” by the Japanese—was under the command of Rear Admiral Takatsugu Jojima. At the same time but in a separate operation, the three heavy cruisers of Cruiser Division 6 (CruDiv6)—Aoba, Kinugasa, and Furutaka, under the command of Rear Admiral Aritomo Gotō—were to bombard Henderson Field with special explosive shells with the object of destroying the CAF and the airfield’s facilities. Two screening destroyers—Fubuki and Hatsuyuki—accompanied CruDiv6. Since U.S. Navy warships had yet to attempt to interdict any Tokyo Express missions to Guadalcanal, the Japanese were not expecting any opposition from U.S. naval surface forces that night.

Battle

Prelude

At 08:00, on 11 October, Jojima’s reinforcement group departed the Shortland Islands anchorage to begin their 250 mi (220 nmi; 400 km) run down the Slot to Guadalcanal. The six destroyers that accompanied Nisshin and Chitose were Asagumo, Natsugumo, Yamagumo, Shirayuki, Murakumo, and Akizuki. Gotō departed the Shortland Islands for Guadalcanal at 14:00 the same day.

To protect the reinforcement group’s approach to Guadalcanal from the CAF, the Japanese 11th Air Fleet, based at Rabaul, Kavieng, and Buin, planned two air strikes on Henderson Field for 11 October. A “fighter sweep” of 17 Mitsubishi A6M3 Zero fighters swept over Henderson Field just after mid-day but failed to engage any U.S. aircraft. Forty-five minutes later, the second wave—45 Mitsubishi G4M2 “Betty” bombers and 30 Zeros—arrived over Henderson Field. In an ensuing air battle with the CAF, one G4M and two U.S. fighters were downed. Although the Japanese attacks failed to inflict significant damage, they did prevent CAF bombers from finding and attacking the reinforcement group. As the reinforcement group transited the Slot, relays of 11th Air Fleet Zeros from Buin provided escort. Emphasizing the importance of this convoy for Japanese plans, the last flight of the day was ordered to remain on station over the convoy until darkness, then ditch their aircraft and await pickup by the reinforcement group’s destroyers. All six Zeros ditched; only one pilot was recovered.

Allied reconnaissance aircraft sighted Jojima’s supply convoy 210 mi (180 nmi; 340 km) from Guadalcanal between Kolombangara and Choiseul in the Slot at 14:45 on the same day, and reported it as two “cruisers” and six destroyers. Gotō’s force—following the convoy—was not sighted. In response to the sighting of Jojima’s force, at 16:07 Scott turned toward Guadalcanal for an interception.

Scott crafted a simple battle plan for the expected engagement. His ships would steam in column with his destroyers at the front and rear of his cruiser column, searching across a 300 degree arc with SG surface radar in an effort to gain positional advantage on the approaching enemy force. The destroyers were to illuminate any targets with searchlights and discharge torpedoes while the cruisers were to open fire at any available targets without awaiting orders. The cruiser’s float aircraft, launched in advance, were to find and illuminate the Japanese warships with flares. Although Helena and Boise carried the new, greatly improved SG radar, Scott chose San Francisco as his flagship.

At 22:00, as Scott’s ships neared Cape Hunter at the northwest end of Guadalcanal, three of Scott’s cruisers launched floatplanes. One crashed on takeoff, but the other two patrolled over Savo Island, Guadalcanal, and Ironbottom Sound. As the floatplanes were launched, Jojima’s force was just passing around the mountainous northwestern shoulder of Guadalcanal, and neither force sighted each other. At 22:20, Jojima radioed Gotō and told him that no U.S. ships were in the vicinity. Although Jojima’s force later heard Scott’s floatplanes overhead while unloading along the north shore of Guadalcanal, they failed to report this to Gotō.

At 22:33, just after passing Cape Esperance, Scott’s ships assumed battle formation. The column was led by Farenholt, Duncan, and Laffey, and followed by San Francisco, Boise, Salt Lake City, and Helena. Buchanan and McCalla brought up the rear. The distance between each ship ranged from 500 to 700 yd (460 to 640 m). Visibility was poor because the moon had already set, leaving no ambient light and no visible sea horizon.

Gotō’s force passed through several rain squalls as they approached Guadalcanal at 30 kn (35 mph; 56 km/h). Gotō’s flagship Aoba led the Japanese cruisers in column, followed by Furutaka and Kinugasa. Fubuki was starboard of Aoba and Hatsuyuki to port. At 23:30, Gotō’s ships emerged from the last rain squall and began appearing on the radar scopes of Helena and Salt Lake City. The Japanese, however, whose warships were not equipped with radar, remained unaware of Scott’s presence.

Action

At 23:00, the San Francisco aircraft spotted Jojima’s force off Guadalcanal and reported it to Scott. Scott, believing that more Japanese ships were likely still on the way, continued his course towards the west side of Savo Island. At 23:33, Scott ordered his column to turn towards the southwest to a heading of 230°. All of Scott’s ships understood the order as a column movement except Scott’s own ship, San Francisco. As the three lead U.S. destroyers executed the column movement, San Francisco turned simultaneously. Boise—following immediately behind—followed San Francisco, thereby throwing the three van destroyers out of formation.

At 23:32, Helena’s radar showed the Japanese warships to be about 27,700 yd (25,300 m) away. At 23:35, Boise’s and Duncan’s radars also detected Gotō’s ships. Between 23:42 and 23:44, Helena and Boise reported their contacts to Scott on San Francisco who mistakenly believed that the two cruisers were actually tracking the three U.S. destroyers that were thrown out of formation during the column turn. Scott radioed Farenholt to ask if the destroyer was attempting to resume its station at the front of the column. Farenholt replied, “Affirmative, coming up on your starboard side,” further confirming Scott’s belief that the radar contacts were his own destroyers.

At 23:45, Farenholt and Laffey—still unaware of Gotō’s approaching warships—increased speed to resume their stations at the front of the U.S. column. Duncan’s crew, however, thinking that Farenholt and Laffey were commencing an attack on the Japanese warships, increased speed to launch a solitary torpedo attack on Gotō’s force without telling Scott what they were doing. San Francisco’s radar registered the Japanese ships, but Scott was not informed of the sighting. By 23:45, Gotō’s ships were only 5,000 yd (4,600 m) away from Scott’s formation and visible to Helena’s and Salt Lake City’s lookouts. The U.S. formation at this point was in position to cross the T of the Japanese formation, giving Scott’s ships a significant tactical advantage. At 23:46, still assuming that Scott was aware of the rapidly approaching Japanese warships, Helena radioed for permission to open fire, using the general procedure request, “Interrogatory Roger” (meaning, basically, “Are we clear to act?”). Scott answered with, “Roger,” only meaning that the message was received, not that he was confirming the request to act. Upon receipt of Scott’s “Roger,” Helena—thinking they now had permission—opened fire, quickly followed by Boise, Salt Lake City, and to Scott’s further surprise, San Francisco.

Gotō’s force was taken almost completely by surprise. At 23:43, Aoba’s lookouts sighted Scott’s force, but Gotō assumed that they were Jojima’s ships. Two minutes later, Aoba’s lookouts identified the ships as American, but Gotō remained skeptical and directed his ships to flash identification signals. As Aoba’s crew executed Gotō’s order, the first American salvo smashed into Aoba’s superstructure. Aoba was quickly hit by up to 40 shells from Helena, Salt Lake City, San Francisco, Farenholt, and Laffey. The shell hits heavily damaged Aoba’s communications systems and demolished two of her main gun turrets as well as her main gun director. Several large-caliber projectiles passed through Aoba’s flag bridge without exploding, but the force of their passage killed many men and mortally wounded Gotō.

Scott—still unsure who his ships were firing at, and afraid that they might be firing on his own destroyers—ordered a ceasefire at 23:47, although not every ship complied. Scott ordered Farenholt to flash her recognition signals and upon observing that Farenholt was close to his formation, he ordered the fire resumed at 23:51.

Aoba, continuing to receive damaging hits, turned to starboard to head away from Scott’s formation and began making a smoke screen which led most of the Americans to believe that she was sinking. Scott’s ships shifted their fire to Furutaka, which was following behind Aoba. At 23:49, Furutaka was hit in her torpedo tubes, igniting a large fire that attracted even more shellfire from the US ships. At 23:58, a torpedo from Buchanan hit Furutaka in her forward engine room, causing severe damage. During this time, San Francisco and Boise sighted Fubuki about 1,400 yd (1,300 m) away and raked her with shellfire, joined soon by most of the rest of Scott’s formation. Heavily damaged, Fubuki began to sink. Kinugasa and Hatsuyuki chose turning to port rather than starboard and escaped the Americans’ immediate attention.

During the exchange of gunfire, Farenholt received several damaging hits from both the Japanese and American ships, killing several men. She escaped from the crossfire by crossing ahead of San Francisco and passing to the disengaged side of Scott’s column. Duncan—still engaged in her solitary torpedo attack on the Japanese formation—was also hit by gunfire from both sides, set afire, and looped away in her own effort to escape the crossfire.

As Gotō’s ships endeavored to escape, Scott’s ships tightened their formation and then turned to pursue the retreating Japanese warships. At 00:06, two torpedoes from Kinugasa barely missed Boise. Boise and Salt Lake City turned on their searchlights to help target the Japanese ships, giving Kinugasa’s gunners clear targets. At 00:10, two shells from Kinugasa exploded in Boise’s main ammunition magazine between turrets one and two. The resulting explosion killed almost 100 men and threatened to blow the ship apart. Seawater rushed in through rents in her hull opened by the explosion and helped quench the fire before it could explode the ship’s powder magazines. Boise immediately sheered out of the column and retreated from the action. Kinugasa and Salt Lake City exchanged fire with each other, each hitting the other several times, causing minor damage to Kinugasa and damaging one of Salt Lake City’s boilers, reducing her speed.

At 00:16, Scott ordered his ships to turn to a heading of 330° in an attempt to pursue the fleeing Japanese ships. Scott’s ships, however, quickly lost sight of Gotō’s ships, and all firing ceased by 00:20. The American formation was beginning to scatter, so Scott ordered a turn to 205° to disengage.

Retreat

During the battle between Scott’s and Gotō’s ships, Jojima’s reinforcement group completed unloading at Guadalcanal and began its return journey unseen by Scott’s warships, using a route that passed south of the Russell Islands and New Georgia. Despite extensive damage, Aoba was able to join Kinugasa in retirement to the north through the Slot. Furutaka’s damage caused her to lose power around 00:50, and she sank at 02:28, 22 mi (19 nmi; 35 km) northwest of Savo Island. Hatsuyuki picked up Furutaka’s survivors and joined the retreat northward.

Boise extinguished her fires by 02:40 and at 03:05 rejoined Scott’s formation. Duncan—on fire—was abandoned by her crew at 02:00. Unaware of Duncan’s fate, Scott detached McCalla to search for her and retired with the rest of his ships towards Nouméa, arriving in the afternoon of 13 October. McCalla located the burning, abandoned Duncan about 03:00, and several members of McCalla’s crew made an attempt to keep her from sinking. By 12:00, however, they had to abandon the effort as bulkheads within Duncan collapsed causing the ship to finally sink 6 mi (5.2 nmi; 9.7 km) north of Savo Island. American servicemen in boats from Guadalcanal as well as McCalla picked up Duncan’s scattered survivors from the sea around Savo. In total, 195 Duncan sailors survived; 48 did not. As they rescued Duncan’s crew, the Americans came across the more than 100 Fubuki survivors, floating in the same general area. The Japanese initially refused all rescue attempts but a day later allowed themselves to be picked up and taken prisoner.

Jojima—learning of the bombardment force’s crisis—detached destroyers Shirayuki and Murakumo to assist Furutaka or her survivors and Asagumo and Natsugumo to rendezvous with Kinugasa, which had paused in her retreat northward to cover the withdrawal of Jojima’s ships. At 07:00, five CAF Douglas SBD-3 Dauntless dive bombers attacked Kinugasa but inflicted no damage. At 08:20, 11 more SBDs found and attacked Shirayuki and Murakumo. Although they scored no direct hits, a near miss caused Murakumo to begin leaking oil, marking a trail for other CAF aircraft to follow. A short time later, seven more CAF SBDs plus six Grumman TBF-1 Avenger torpedo bombers, accompanied by 14 Grumman F4F-4 Wildcats, found the two Japanese destroyers 170 mi (150 nmi; 270 km) from Guadalcanal. In the ensuing attack, Murakumo was hit by a torpedo in her engineering spaces, leaving her without power. In the meantime, Aoba and Hatsuyuki reached the sanctuary of the Japanese base in the Shortland Islands at 10:00.

Rushing to assist Murakumo, Asagumo and Natsugumo were attacked by another group of 11 CAF SBDs and TBFs escorted by 12 fighters at 15:45. An SBD placed its bomb almost directly amidships on Natsugumo while two more near misses contributed to her severe damage. After Asagumo took off her survivors, Natsugumo sank at 16:27. The CAF aircraft also scored several more hits on the stationary Murakumo, setting her afire. After her crew abandoned ship, Shirayuki scuttled her with a torpedo, picked up her survivors, and joined the rest of the Japanese warships for the remainder of their return trip to the Shortland Islands.

Aftermath and Significance

Captain Kikunori Kijima—Gotō’s chief of staff and commander of the bombardment force during the return trip to the Shortland Islands after Gotō’s death in battle—claimed that his force had sunk two American cruisers and one destroyer. Furutaka’s captain—who survived the sinking of his ship—blamed the loss of his cruiser on bad air reconnaissance and poor leadership from the 8th fleet staff under Admiral Mikawa. Although Gotō’s bombardment mission failed, Jojima’s reinforcement convoy was successful in delivering the crucial men and equipment to Guadalcanal. Aoba journeyed to Kure, Japan, for repairs that were completed on February 15, 1943. Kinugasa was sunk one month later during the Naval Battle of Guadalcanal.

Scott claimed that his force sank three Japanese cruisers and four destroyers. News of the victory was widely publicized in the American media. Boise—which was damaged enough to require a trip to the Philadelphia Naval Shipyard for repairs—was dubbed the “one-ship fleet” by the press for her exploits in the battle, although this was mainly because the names of the other involved ships were withheld for security reasons. Boise was under repair until 20 March 1943.

Although a tactical victory for the U.S., Cape Esperance had little immediate strategic effect on the situation on Guadalcanal. Just two days later on the night of 13 October, the Japanese battleships Kongō and Haruna bombarded and almost destroyed Henderson Field. One day after that, a large Japanese convoy successfully delivered 4,500 troops and equipment to the island. These troops and equipment helped complete Japanese preparations for the large land offensive scheduled to begin on 23 October. The convoy of U.S. Army troops reached Guadalcanal on 13 October as planned and were key participants for the Allied side in the decisive land battle for Henderson Field that took place from 23–26 October.

The Cape Esperance victory helped prevent an accurate U.S. assessment of Japanese skills and tactics in naval night fighting. The U.S. was still unaware of the range and power of Japanese torpedoes, the effectiveness of Japanese night optics, and the skilled fighting ability of most Japanese destroyer and cruiser commanders. Incorrectly applying the perceived lessons learned from this battle, U.S. commanders in future naval night battles in the Solomons consistently tried to prove that American naval gunfire was more effective than Japanese torpedo attacks. This belief was severely tested just two months later during the Battle of Tassafaronga. A junior officer on Helena later wrote, “Cape Esperance was a three-sided battle in which chance was the major winner.”

The heavily damaged Japanese cruiser Aoba off Buin, Bougainville on October 13, 1942 after the Battle of Cape Esperance. Photographed from the Japanese cruiser Chokai.

U.S. Rear Admiral Norman Scott.

Japanese Rear Admiral Aritomo Gotō.

U.S. Navy heavy cruiser USS San Francisco (CA-38) off the Mare Island Naval Shipyard, California (USA), following overhaul, on 13 October 1944. She is painted in Camouflage Measure 33, Design 13D.

U.S. Navy heavy cruiser USS Salt Lake City (CA-25) at Dutch Harbor, Alaska (USA), on 29 March 1943, three days after the Battle of the Komandorski Islands.

U.S. Navy light cruiser USS Helena (CL-50) at a South Pacific base, between battles, circa in 1943. This image has been retouched to remove radar antennas from the gun directors and masts.

U.S. Navy light cruiser USS Boise (CL-47) photographed circa in late August 1942, probably at Espiritu Santo, New Hebrides.

U.S. Navy destroyer USS Duncan (DD-485) underway in the South Pacific on 7 October 1942, five days before she was sunk in the Battle of Cape Esperance. The photo was taken from the escort carrier USS Copahee (ACV-12), which was then engaged in delivering aircraft to Guadalcanal.

U.S. Navy destroyer USS Farenholt (DD-491) off Pearl Harbor, circa May 1943.

USS McCalla (DD-488) off Federal Shipbuilding & Dry Dock Co., Kearny, New Jersey, 26 May 1942, the day before she commissioned.

The destroyer USS Laffey (DD-459) steams alongside another U.S. Navy ship, while at sea in the south Pacific on 4 September 1942.

Japanese cruiser Furutaka underway, after her smokestacks were raised.

Imperial Japanese Navy destroyer Fubuki.

Japanese destroyer Hatsuyuki.

Japanese destroyer Asagumo.

Japanese destroyer Shirayuki in 1931.

Japanese destroyer Murakumo.

Imperial Japanese Navy Destroyer Akizuki blows up and is burnt. This incident was Battle off Cape Engaño in the Battle of Leyte Gulf, October 25, 1944.

U.S. Navy sailor W.R. Martin points out details of the Japanese trophy flags painted on the pilothouse of the light cruiser USS Boise (CL-47) as a scoreboard of enemy ships claimed sunk in the Battle of Cape Esperance, 11-12 October 1942. The six Japanese ships (two heavy cruisers, a light cruiser and three destroyers) represented in this scoreboard greatly overstates the actual enemy losses, which were one heavy cruiser (Furutaka) and one destroyer (Fubuki) sunk and one heavy cruiser (Aoba) badly damaged. This overclaiming was typical of contemporary night surface actions. The photo was taken at the Philadelphia Naval Shipyard, Pennsylvania (USA), soon after Boise arrived there for battle damage repairs in November 1942.

U.S. Navy light cruiser USS Boise (CL-47) arrives at the Philadelphia Naval Shipyard, Pennsylvania (USA), for battle damage repairs, in November 1942. She had been hit by enemy shellfire in the Battle of Cape Esperance on 12 October 1942, resulting in a large fire that burned out her three forward 6”/47 gun turrets and their ammunition spaces.

U.S. Navy light cruiser USS Boise (CL-47) arrives at the Philadelphia Naval Shipyard, Pennsylvania (USA), in November 1942 for repair of battle damage received during the 11-12 October Battle of Cape Esperance. Note the forward 6”/47 triple gun turret trained to starboard. It was jammed in this position during the action, when a Japanese 8” shell hit the armored barbette just below the turret.

U.S. Army Private First Class Felix A. Uva (left) and Corporal Donald A. Purdy examine a memorial plaque on the main deck of the U.S. Navy light cruiser USS Boise (CL-47), while they were being transported to the United States from Europe as part of Operation “Magic Carpet” in November 1945. This plaque was presented to the ship by the citizens of Boise, Idaho (USA), in memory of the 107 crewmembers who lost their lives in the Battle of Cape Esperance, 11-12 October 1942. Note kapok life jackets worn by the soldiers.

United States Strategic Bombing Survey map of Battle of Cape Esperance. Based on interviews with Japanese participants in the battle.

World War II era recognition drawings for Aoba-class heavy cruisers.

 

Actions Along the Matanikau

Marines cross the Matanikau River aboard a permanent ferry, complete with landing stages at both ends. The raft was fashioned by Marine engineers from 55-gallon fuel drums. (Official USMC photo)

The Actions along the Matanikau—sometimes referred to as the Second and Third Battles of the Matanikau—were two separate but related engagements, which took place in the months of September and October 1942, among a series of engagements between the United States and Imperial Japanese naval and ground forces around the Matanikau River on Guadalcanal (island in the south-western Pacific, northeast of Australia) during the Guadalcanal Campaign. These particular engagements—the first taking place between 23 and 27 September, and the second between 6 and 9 October—were two of the largest and most significant of the Matanikau actions.

The Matanikau River area included a peninsula called Point Cruz, the village of Kokumbona, and a series of ridges and ravines stretching inland from the coast. Japanese forces used the area to regroup from attacks against U.S. forces on the island, to launch further attacks on the U.S. defenses that guarded the Allied airfield (called Henderson Field) located at Lunga Point on Guadalcanal, as a base to defend against Allied attacks directed at Japanese troop and supply encampments between Point Cruz and Cape Esperance on western Guadalcanal, and as a location for watching and reporting on Allied activity around Henderson Field.

In the first action, elements of three U.S. Marine battalions under the command of U.S. Marine Major General Alexander Vandegrift attacked Japanese troop concentrations at several points around the Matanikau River. The Marine attacks were intended to “mop-up” Japanese stragglers retreating towards the Matanikau from the recent Battle of Edson’s Ridge, to disrupt Japanese attempts to use the Matanikau area as a base for attacks on the Marine Lunga defenses, and to destroy any Japanese forces in the area. The Japanese—under the overall command of Major General Kiyotake Kawaguchi—repulsed the Marine attacks. During the action, three U.S. Marine companies were surrounded by Japanese forces, took heavy losses, and barely escaped with assistance from a U.S. Navy destroyer and landing craft manned by U.S. Coast Guard personnel.

In the second action two weeks later, a larger force of U.S. Marines successfully crossed the Matanikau River, attacked Japanese forces under the command of newly arrived generals Masao Maruyama and Yumio Nasu, and inflicted heavy casualties on a Japanese infantry regiment. The second action forced the Japanese to retreat from their positions east of the Matanikau and hindered Japanese preparations for their planned major offensive on the U.S. Lunga defenses set for later in October 1942 that resulted in the Battle for Henderson Field.

Background

On 7 August 1942, Allied forces (primarily American) landed on Guadalcanal, Tulagi, and Florida Islands in the Solomon Islands. The landings on the islands were meant to deny their use by the Japanese as bases for threatening the supply routes between the U.S. and Australia, and secure the islands as starting points for a campaign with the eventual goal of neutralizing the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign. 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, later called Henderson Field by Allied forces, under construction at Lunga Point on Guadalcanal.

In response to the Allied landings on Guadalcanal, the Japanese Imperial General Headquarters assigned the Imperial Japanese Army’s 17th Army—a corps-sized command based at Rabaul and under the command of Lieutenant-General Harukichi Hyakutake—with the task of retaking Guadalcanal from Allied forces. The 17th Army, by this time heavily involved with the Japanese campaign in New Guinea, 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, the 4th (Aoba) Infantry Regiment was in the Philippines and the 28th (Ichiki) Infantry Regiment was embarked on transport ships near Guam. The different units began to move towards Guadalcanal immediately, but Ichiki’s regiment—being the closest—arrived first. The “First Element” of Ichiki’s unit—consisting of about 917 soldiers—landed from destroyers at Taivu Point, east of the Lunga perimeter, on 19 August, attacked the U.S. Marine defenses, and were almost completely annihilated during the resulting Battle of the Tenaru on 21 August.

Between 29 August and 7 September, Japanese destroyers (called “Tokyo Express” by Allied forces), plus a convoy of slow barges, delivered the 6,000 men of Kawaguchi’s brigade, including the rest of Ichiki’s regiment (called the Kuma Battalion) and much of the Aoba regiment, to Guadalcanal. General Kawaguchi and 5,000 of the troops landed 20 mi (32 km) east of the Lunga Perimeter at Taivu Point. The other 1,000 troops—under the command of Colonel Akinosuke Oka—landed west of the Lunga Perimeter at Kokumbona. 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 (Edson’s Raiders)—from Tulagi and Gavutu to Guadalcanal.

Kawaguchi’s Center Body of 3,000 troops began their attacks on a ridge south of Henderson Field beginning on 12 September in what was later called the Battle of Edson’s Ridge. After numerous frontal assaults, Kawaguchi’s attack was repulsed with heavy losses for the Japanese, who retreated back into the jungle on 14 September. Oka’s assault in the west and the Kuma Battalion’s assault in the east were also repulsed by the U.S. Marines over the same two days. Kawaguchi’s units were ordered to withdraw west to the Matanikau Valley to join with Oka’s unit on the west side of the Lunga Perimeter. Most of Kawaguchi’s men reached the Matanikau by 20 September.

As the Japanese regrouped west of the Matanikau, the U.S. forces concentrated on shoring up and strengthening their Lunga defenses. On 18 September, an Allied naval convoy delivered 4,157 men from the 3rd Provisional Marine Brigade (U.S. 7th Marine Regiment) to Guadalcanal. These reinforcements allowed Vandegrift—beginning on 19 September—to establish an unbroken line of defense completely around the Lunga perimeter.

The Japanese immediately began to prepare for their next attempt to recapture Henderson Field. The 3rd Battalion, 4th (Aoba) Infantry Regiment had landed at Kamimbo Bay on the western end of Guadalcanal on 11 September, too late to join Kawaguchi’s attack on the U.S. Marines. By then, though, the battalion had joined Oka’s forces near the Matanikau. Subsequent Tokyo Express runs—beginning on 15 September—brought food and ammunition—as well as 280 men from the 1st Battalion, Aoba Regiment—to Kamimbo on Guadalcanal.

U.S. Marine Lieutenant General Vandegrift and his staff were aware that Kawaguchi’s troops had retreated to the area west of the Matanikau and that numerous groups of Japanese stragglers were scattered throughout the area between the Lunga Perimeter and the Matanikau River. Two previous raids by Marines—on 19 and 29 August—had killed some of the Japanese forces camped in that area but had failed to deny the location as an assembly area and defensive position for the Japanese forces threatening the western portion of the Marine defenses. Vandegrift, therefore, decided to conduct another series of small unit operations around the Matanikau Valley. The purpose of these operations was to “mop-up” the scattered groups of Japanese troops east of the Matanikau and to keep the main body of Japanese soldiers off-balance to prevent them from consolidating their positions so close to the main Marine defenses at Lunga Point. The first operation was assigned to the 1st Battalion, 7th Marine Regiment under Lieutenant Colonel Chesty Puller with a start date of 23 September. The operation would be supported by artillery fire from the U.S. 11th Marine Regiment.

September Action

Prelude

The U.S. Marine plan called for Puller’s battalion to march west from the Lunga perimeter, scale a large terrain feature called Mount Austen, cross the Matanikau River, and then reconnoiter the area between the Matanikau and Kokumbona village. At the same time, the 1st Raider Battalion—now under the command of Lieutenant Colonel Samuel B. Griffith—was to cross at the mouth of the Matanikau to explore the area between the river, Kokumbona, and further west towards Tassafaronga. The Marines thought that there were about 400 Japanese in that area.

The number of Japanese troops in the Matanikau Valley was actually much higher than the Marine estimate. Believing that the Allies might attempt a major amphibious landing near the Matanikau River, Kawaguchi assigned Oka’s 124th Infantry Regiment—numbering about 1,900 men—to defend the Matanikau. Oka deployed his “Maizuru” Battalion around the base of Mount Austen and along the west and east banks of the Matanikau River. The rest of Oka’s force was located west of the Matanikau, but in position to respond quickly to any Allied attacks in that area. Including other Japanese troops located near Kokumbona, total Japanese forces in the general Matanikau area numbered about 4,000.

Action

The 930 men of Puller’s battalion marched west from the Lunga perimeter early on the morning of 23 September. Later that morning, Puller’s troops chased away two Japanese patrols that were reconnoitering the Marine Lunga defenses. Puller’s battalion then camped for the night and prepared to climb Mount Austen the next day.

At 17:00 on 24 September, as Puller’s men hiked up the northeast slope of Mount Austen, they surprised and killed a bivouac of 16 Japanese soldiers. The noise from the skirmish alerted several companies of Oka’s Maizuru Battalion, who were emplaced nearby. The Maizuru troops quickly attacked Puller’s Marines, who took cover and returned fire. Acting on Oka’s orders, the Japanese slowly disengaged while withdrawing towards the Matanikau River, and the engagement was over by nightfall. The Marines counted 30 dead Japanese and had suffered 13 dead and 25 wounded. Puller radioed headquarters and requested help to evacuate the wounded. Vandegrift replied that he would send the 2nd Battalion, 5th Marine Regiment (2/5) as reinforcements the next day.

2/5—under Lieutenant Colonel David McDougal—rendezvoused with Puller’s unit early on 25 September. Puller sent his casualties back to the Lunga perimeter with three companies of his battalion and continued on with the mission with his remaining company (Company C), his headquarters staff, and 2/5, and they bivouacked for the night between Mount Austen and the Matanikau River.

On the morning of 26 September, Puller and McDougal’s troops reached the Matanikau River and attempted to cross over a bridge previously built by the Japanese that was called the “one-log bridge.” Because of resistance by about 100 Japanese defenders around the bridge, the Marines instead proceeded north along the east bank of the Matanikau to the sand spit on the coast at the mouth of the river. Oka’s troops repulsed a Marine attempt to cross the Matanikau at the sand spit as well as another attempt to cross the one-log bridge later in the afternoon. In the meantime, Griffith’s Raider battalion—along with Merritt A. Edson, commander of the 5th Marine Regiment—joined Puller and McDougal’s troops at the mouth of the Matanikau.

Edson brought with him a “hastily devised” plan of attack—primarily written by Lieutenant Colonel Merrill B. Twining, a member of Vandegrift’s division staff—that called for Griffith’s Raiders—along with Puller’s Company C—to cross the one-log bridge and then outflank the Japanese at the river mouth/sand spit from the south. At the same time, McDougal’s battalion was to attack across the sand spit. If the attacks were successful, the rest of Puller’s battalion would land by boat west of Point Cruz to take the Japanese by surprise from the rear. Aircraft from Henderson Field—as well as Marine 75 mm (2.95 in) and 105 mm (4.1 in) artillery—would provide support for the operation. The Marine offensive would begin the next day, on 27 September.

The Marine attack on the morning of 27 September did not make much headway. Griffith’s Raiders were unable to advance at the one-log bridge over the Matanikau, suffering several casualties, including the death of Major Kenneth D. Bailey and the wounding of Griffith. A flanking attempt by the Raiders further upstream also failed. The Japanese, who had reinforced their units at the mouth of the Matanikau during the night with additional companies from the 124th Infantry Regiment, repulsed the attacks by McDougal’s men.

As a result of “garbled” messages from Griffith because of a Japanese air raid on Henderson Field that disrupted the Marine communication’s net, Vandegrift and Edson believed that the Raiders had succeeded in crossing the Matanikau. Therefore, Puller’s battalion was ordered to proceed with the planned landing west of Point Cruz. Three companies of Puller’s battalion, under Major Otho Rogers, landed from nine landing craft just west of Point Cruz at 13:00. Rogers’ Marines pushed inland and occupied a ridge, called Hill 84, about 600 yd (550 m) from the landing area. Oka—recognizing the seriousness of this landing—ordered his forces to close on Rogers’ Marines from both the west and east.

Soon after occupying the ridge, Rogers’ men came under heavy fire from two directions from Oka’s forces. Major Rogers was hit by a mortar shell that blew him in half, killing him instantly. Captain Charles Kelley—commander of one of the companies—took command and deployed the Marines in a perimeter defense around the ridge to fight back. The Marines on Hill 84 were without radio communication and thus could not call for help. The Marines improvised by using white undershirts to spell out the word “H-E-L-P” on the ridge. A Cactus Air Force (the name for the Allied aircraft operating out of Henderson Field) SBD Dauntless supporting the operation spotted the undershirt message and relayed the message to Edson by radio.

Paul Moore, Jr., a Marine veteran who participated in the battle, described it:

Each... [platoon] was to run across the sandspit until they were opposite the bank, wade across the river, and attack the Japanese battalion, which was dug in with automatic weapons and hand grenades and mortars in the bank.... Well, one platoon went over and got annihilated. Another platoon went over and got annihilated. Then another... we all realized it was insane... But if you’re a Marine, you’re ordered across the goddamn beach and you go.

Edson received a message from the Raider Battalion reporting their failure to cross the Matanikau. Edson, speaking to those around him, stated, “I guess we better call them off. They can’t seem to cross the river.” Puller angrily replied, “You’re not going to throw these men away!” apparently in reference to his men trapped on the west side of the Matanikau, and “stormed” off toward the beach where, with the help of his personal signalman, Puller was able to hail the Navy destroyer USS Monssen that was supporting the operation. Once aboard Monssen, Puller and the destroyer led 10 landing craft towards Point Cruz and established communications with Kelley on the ridge by signal flag.

By this time, Oka’s troops had moved into position to completely cut off the Marines on Hill 84 from the coast. Therefore, Monssen—coordinated by Puller—began to blast a path between the ridge and the beach. After about 30 minutes of firing by the destroyer, the way was clear for the Marines to escape to the beach. Despite taking some casualties from their own artillery fire, most of the Marines made it to the beach near Point Cruz by 16:30. Oka’s troops put heavy fire on the Marines at the beach in effort to keep them from successfully evacuating, and the U.S. Coast Guard crews manning the U.S. landing craft responded with their own heavy fire to cover the Marines’ withdrawal. Under fire, the Marines boarded the landing craft and successfully returned to the Lunga perimeter, ending the action. U.S. Coast Guard Signalman First Class Douglas Albert Munro—Officer-in-Charge of the group of Higgins boats—was killed while providing covering fire from his landing craft for the Marines as they evacuated the beach and was posthumously awarded the Medal of Honor for the action, to date the only Coast Guardsman to receive the decoration.

Aftermath

The results of the action were gratifying to the Japanese, still recovering from their defeat at Edson’s Ridge two weeks prior. Oka’s troops counted 32 bodies of U.S. Marines around Hill 84, and they captured 15 rifles and several machine guns that the Marines left behind. Major General Akisaburo Futami—chief of staff for the 17th Army at Rabaul—noted in his diary that this action was “the first good news to come from Guadalcanal.”

The action—described as “an embarrassing defeat” for the U.S. Marines—resulted in “finger-pointing” among the Marine commanders as they sought to attribute blame. Puller blamed Griffith and Edson, Griffith blamed Edson, and Twining blamed Puller and Edson. Colonel Gerald Thomas—Vandegrift’s operations officer—blamed Twining. The Marines, however, learned from the experience, and the defeat was the only one of that size suffered by U.S. Marine forces during the Guadalcanal campaign.

October Action

Prelude

The Japanese continued to deliver additional forces to Guadalcanal in preparation for their planned major offensive in late October. Between 1 and 5 October, Tokyo Express runs delivered troops from the 2nd Infantry Division, including their commander, Lieutenant General Masao Maruyama. These troops consisted of units from the 4th, 16th, and 29th Infantry Regiments. In an attempt to exploit the advantage gained in the September Matanikau action, Maruyama deployed the three battalions of the 4th Infantry Regiment with additional supporting units under Major General Yumio Nasu along the west side of the Matanikau River south of Point Cruz with three companies from the 4th Infantry Regiment placed on the east side of the river. Oka’s exhausted troops were withdrawn from the immediate Matanikau area. The Japanese units east of the river were to assist in preparing positions from which heavy artillery could fire into the U.S. Marines’ perimeter around Lunga Point.

Aware of the Japanese activity around the Matanikau, the U.S. Marines prepared for another offensive in the area with the objective of driving Japanese forces west and away from the Matanikau valley. Applying lessons learned from the September action, this time the Marines prepared a carefully coordinated plan of action involving five battalions: two from the 5th Marine Regiment, two from the 7th Marine Regiment, and one from the 2nd Marine Regiment augmented with Marine scout and sniper personnel (called the Whaling Group after its commander Colonel William J. Whaling). The 5th Marine’s battalions were to attack across the mouth of the Matanikau while the other three battalions were to cross the Matanikau inland at the “one-log bridge,” turn north, and attempt to trap the Japanese forces between themselves and the coast. This time the Marine division headquarters planned to retain control of the entire operation and carefully arranged detailed support for the operation from artillery and aircraft.

Action

On the morning of 7 October, the two 5th Marine battalions attacked west from the Lunga perimeter towards the Matanikau. With direct-fire support from 75 mm guns mounted on halftracks, plus additional troops supplied by the 1st Raider Battalion, the Marines forced 200 soldiers from the Japanese 3rd Company, 1st Battalion, 4th Infantry into a small pocket on the east side of the Matanikau about 400 yd (370 m) from the river mouth. The Japanese 2nd Company tried to come to the aid of their comrades in the 3rd Company but were unable to cross the Matanikau and took casualties from Marine gunfire. Meanwhile, the two 7th Marine battalions and the Whaling Group reached positions east of the one-log bridge unopposed and bivouacked for the night.

Oblivious of the U.S. Marine offensive, General Nasu sent the 9th Company of the 4th Infantry Regiment’s 3rd Battalion across the Matanikau on the evening of 7 October. The Japanese regimental commander received word of the U.S. Marine operation about 03:00 on 8 October and immediately ordered his 1st and 2nd battalions closer to the river to counter the Marine operation.

Rain on 8 October slowed the U.S. 7th Marines and the Whaling Group as they attempted to cross the Matanikau. Near evening the U.S. 3rd Battalion 2nd Marines reached the first ridge west of the Matanikau about 1 mi (1.6 km) from Point Cruz. Opposite their position on the east bank of the river, Company H from the U.S. 2nd Battalion 7th Marines unknowingly advanced into an exposed position between the Japanese 9th Company on the east bank and the rest of the Japanese 3rd Battalion on the west bank and was forced to withdraw. As a result, the Marines halted their attack for the night and prepared to resume it the next day. Unaware that the Marines threatened their positions on the west bank of the Matanikau, the Japanese commanders—including Maruyama and Nasu—ordered their units to hold in place.

During the night, the survivors of the Japanese 3rd Company, about 150 men, attempted to break out of their pocket and cross the sandbar at the mouth of the Matanikau. The 3rd Company soldiers overran two platoons from the 1st Raiders, who were not expecting an attack from that direction, and the resulting hand-to-hand melee left 12 Marines and 59 Japanese dead. The remaining 3rd Company survivors were able to cross the river and reach friendly lines. According to Frank J. Guidone, a Marine participant in the engagement, “The fight was hours of hell. There was yelling, screams of the wounded and dying; rifle firing and machine guns with tracers piercing the night–(a) combination of fog, smoke, and the natural darkness. Truly an arena of death.”

On the morning of 9 October, the U.S. Marines renewed their offensive west of the Matanikau. The Whaling Group and the 2nd Battalion 7th Marines—commanded by Lieutenant Colonel Herman H. Hanneken—reached the shoreline around Point Cruz and trapped large numbers of Japanese troops between themselves and the Matanikau River, where the Japanese took heavy losses from U.S. artillery and aircraft bombardment. Further west, Puller’s 1st Battalion, 7th Marines trapped the Japanese 2nd Battalion, 4th Infantry in a wooded ravine. After calling for massed artillery fire into the ravine, Puller added the fire of his battalion’s mortars to create, in Puller’s words, a “machine for extermination.” The trapped Japanese troops attempted several times to escape by climbing the opposite side of the ravine, only to be cut down in large numbers by massed Marine rifle and machine gun fire. Having received intelligence information that the Japanese were planning a large surprise offensive somewhere on Guadalcanal, Vandegrift ordered all the Marine units west of the Matanikau to disengage and return to the east side of the river, which was accomplished by the evening of 9 October.

Aftermath and Significance

The Marine offensive inflicted heavy casualties on the Japanese 4th Infantry Regiment, killing around 700 Japanese troops. During this operation, 65 Marines were killed.

The same night that the U.S. Marine Matanikau operation ended on 9 October, Lieutenant General Harukichi Hyakutake—the Japanese 17th Army commander—landed on Guadalcanal to personally lead the Japanese forces in their planned large offensive scheduled for later in October. Hyakutake was immediately briefed on the loss of the Japanese positions on the east bank of the Matanikau and the annihilation of one of the 4th Infantry Regiment’s battalions. Hyakutake communicated the news directly to the Army’s General Staff in Tokyo where Lieutenant General Moritake Tanabe of the Operations Division noted in his diary that the loss of the Matanikau position was a “very bad omen” for the planned October offensive.

The Japanese determined that the reestablishment of their forces on the east bank of the Matanikau would be prohibitive in terms of the number of troops required to accomplish it. Therefore, the Japanese devised a plan of attack for their scheduled offensive that sent many of their troops on a long and arduous journey to attack the U.S. Lunga perimeter from inland. The march—which began on 16 October—exhausted the Japanese troops involved to such an extent that it was later considered as one of the major factors in the decisive Japanese defeat in the subsequent Battle for Henderson Field from 23–26 October 1942. Thus, the failure of the Japanese to gain and hold a strong position on the Matanikau proved to have lasting strategic consequences in the battle for Guadalcanal, significantly contributing to the ultimate Allied victory in the campaign.

U.S. Marine patrol crosses the Matanikau River on Guadalcanal, probably in late September or early October 1942.

Dead soldiers from the Japanese 2nd Battalion, 4th Infantry Regiment lie piled in a ravine on Guadalcanal after being killed by mortar and small arms fire from United States Marine Corps troops of the 1st Battalion, 7th Marines under Chesty Puller on October 9, 1942.

Wreckage of the Japanese 1st Independent Tank Company on the sandbar at the mouth of the Matanikau River on Guadalcanal after the failed October 1942 offensive to take Henderson Field. The tank to the left is a Type 95 light, as is the one second from right; the other three are Type 97 mediums.

U.S. Marine 155mm howitzer fires at Japanese forces on Guadalcanal west of the Matanikau River in late October 1942.

U.S. Marine forces in action in the Matanikau area, Guadalcanal, August 19, 1942. 

Map of Matanikau action between U.S. Marines and Japanese forces, September 24-27, 1942, on Guadalcanal. 

U.S. Matanikau offensive on Guadalcanal, October 7-9, 1942.

Map of Allied positions along Matanikau and Lunga Point, Guadalcanal, October 9, 1942.

Conoley's Action, 24-26 October 1942, near the Matanikau River, Guadalcanal.