The Battle of Vella Lavella was fought from 15 August – 6 October 1943 between the Empire of Japan and the Allied forces from New Zealand and the United States at the end of the New Georgia campaign. Vella Lavella, an island located in the Solomon Islands, had been occupied by Japanese forces early during the war in the Pacific. Following the Battle of Munda Point, the Allies recaptured the island in late 1943, following a decision to bypass a large concentration of Japanese troops on the island of Kolombangara.
After a landing at Barakoma on 15 August, US troops advanced along the coasts, pushing the Japanese north. In September, New Zealand troops took over from the Americans, and they continued to advance across the island, hemming the small Japanese garrison along the north coast. On 6 October, the Japanese began an evacuation operation to withdraw the remaining troops, during which the Naval Battle of Vella Lavella was fought. Following the capture of the island, the Allies developed it into an important airbase which was used in the reduction of the main Japanese base at Rabaul.
Background
The fighting on Vella Lavella took place following the Battle of Munda Point on New Georgia, which was fought in the aftermath of the Japanese evacuation from Guadalcanal as the Allies began advancing toward Rabaul under the Operation Cartwheel plan. After the loss of the airfield at Munda Field to US forces, the Japanese had withdrawn to Kolombangara, where they established a 10,000 to 12,000-strong garrison under Major General Noboru Sasaki. Initial US plans following Munda Point had envisaged an assault on Kolombangara, but the US commander, Admiral William Halsey, decided to bypass Kolombangara and land forces around Barakoma near the southeastern tip of the island of Vella Lavella instead where they were to capture the Japanese airfield and develop a naval base.Miller, Cartwheel: The Reduction of Rabaul, pp. 172–175, 185.
Situated northwest of Munda, Vella Lavella was the most northern island in the New Georgia chain and offered a stepping stone for future operations against Japanese forces on the Shortland Islands and on Bougainville. It also offered better prospects for base development than at Kolombangara. At the same time, it was close enough to US airbases at Munda and Sergei Point to afford the required air support that would be necessary to defend against Japanese air attack.Miller, Cartwheel: The Reduction of Rabaul, p. 173.
In late July, a small reconnaissance party was dispatched to Vella Lavella, linking up with an Australian coastwatcher, a New Zealand missionary and several natives, to gather intelligence on Barakoma and the southeast coast.Miller, Cartwheel: The Reduction of Rabaul, pp. 174–175. These men and their native guides managed to explore the island for a full week, avoiding contact with the Japanese. On 31 July, they returned to Guadalcanal with thorough intelligence about the target. The village of Barakoma near the island's southeastern tip was selected as the landing place.Horton, New Georgia: Pattern for Victory, p. 130
On 12 August, an advanced party, consisting of naval and military personnel and a small group of troops from the 103rd Infantry Regiment, was sent from Guadalcanal and Rendova Island to Barakoma aboard four torpedo boats. En route, the boats were subjected to aerial attack which resulted in several casualties, but their crews were able to continue to their destination where they were met by a small group of natives in canoes. As reports were received about a larger-than-expected Japanese force near the landing beach, on 14 August this force was reinforced by more troops from the 103rd Infantry. The force was then tasked with marking and holding the beachhead for the assault force and for securing Japanese prisoners in the vicinity. They subsequently captured seven Japanese. As of 15 August, there were 250 Japanese personnel present on Vella Lavella. These men were a mix of soldiers evacuated from New Georgia and sailors who had been stranded on the island.Rottman, Japanese Army in World War II, p. 68
Battle
US troop landings The initial landing on Vella Lavella was undertaken by a landing force of around 4,600 (rising to 5,800) US troops under Brigadier General Robert B. McClure. The main maneuver elements came from the 35th Regimental Combat Team.Morison, Breaking the Bismarcks Barrier, p. 229; Miller, Cartwheel: The Reduction of Rabaul, p. 176. This regiment was commanded by Colonel Everett E. Brown. It was drawn from the 25th Infantry Division, under Major General J. Lawton Collins, and formed part of Major General Oscar Griswold's XIV Corps. These troops landed on 15 August as part of an expeditionary force (designated Task Force 31) under the command of Rear Admiral Theodore S. Wilkinson, which embarked from Guadalcanal.Miller, Cartwheel: The Reduction of Rabaul, pp. 175–178. The expeditionary force consisted of a variety of vessels including: seven destroyer-transports, three LSTs, two submarine chasers and many LCIs. It was escorted by a destroyer screen of 12 ships, while P-40 and Corsair fighters patrolled the air above.Morison, Breaking the Bismarcks Barrier, pp. 228–230.Horton, New Georgia: Pattern for Victory, p. 135
The Japanese dispatched a large number of Zero fighters and Val dive-bombers in response to the landing. They attacked the LSTs around noon but were driven off by massed anti-aircraft fire. A further attempt late in the day was also spoiled. The returning Japanese aircraft were attacked by US Marine Corsairs that had been tasked to conduct a strafing mission around Kahili. In the early evening, a small group of Japanese torpedo aircraft unsuccessfully attacked the LCIs, while several seaplanes attacked the LSTs around midnight. Losses during these attacks were light for the Americans, with no ships being sunk and only two defending US aircraft being shot down, against Japanese losses of between 17 and 44 aircraft.Morison, Breaking the Bismarcks Barrier, pp. 231–232.
Casualties during the initial landing amounted to 12 killed and 50 wounded for the Americans. After the initial fighting, the Americans established a beachhead and began resupply operations. Meanwhile, the Japanese decided against a counterattack, electing to evacuate the island instead. A barge depot was established for the evacuation at Horaniu, on the northeast coast of the island. A group of destroyers (Sazanami, Hamakaze, Shigure, and Isokaze, under Rear Admiral Matsuji Ijuin) sailed from Rabaul while a group of reinforcements was also dispatched to secure Horaniu.Morison, Breaking the Bismarcks Barrier, pp. 233–234. These consisted of two companies of the 13th Infantry Regiment, with a combined strength of 390 soldiers, and a platoon of Special Naval Landing Force troops.
In response, four US destroyers (, , and ) sailed from Purvis Bay under the command of Captain Thomas J. Ryan to disrupt the Japanese landing. Throughout 18 August, US and Japanese destroyers engaged each other off Horaniu, during which two Japanese destroyers were damaged and several smaller vessels destroyed. While this fighting was taking place at sea, the troop-laden Japanese barges made for the north coast, where they camouflaged themselves and hid. Their landing at Horaniu was completed the following day on 19 August. While the Japanese worked to establish their barge depot, two more echelons of US troops and supplies were dispatched for Barakoma, on 17 and 20 August respectively. These were subjected to further Japanese air attacks, during which LST-396 was lost and several other ships were damaged, including the destroyer which accidentally collided with .Morison, Breaking the Bismarcks Barrier, pp. 234–238. Gordan Rottman has written that the Japanese force on Vella Lavella eventually reached 750 men. Jon Diamond provides a higher figure, stating that 1,000 Japanese served on the island.
While the main action occurred at sea and in the air, US troops ashore worked to improve the defenses around the beachhead and began limited patrol operations. In late August, a US reconnaissance patrol searching for a suitable location for a radar site discovered a strong concentration of Japanese troops around Kokolope Bay. McClure subsequently began an advance along the east coast of the island supported by native guides and a small group of Fijian scouts, aimed at capturing Kokolope Bay in order to establish the radar site. As the troops from the 1st Battalion, 35th Infantry pushed beyond their beachhead, a battalion of the 145th Infantry Regiment arrived from New Georgia to hold the perimeter. The 3rd Battalion, 35th Infantry and the 64th Field Artillery Battalion also joined the advance up the east coast. Several small scale skirmishes followed, but largely the Japanese sought to avoid decisive engagement. On 14 September, Horaniu was captured after the Japanese garrison withdrew to the northeast of the island.Miller, Cartwheel: The Reduction of Rabaul, p. 183.Morison, Breaking the Bismarcks Barrier, pp. 233–239.
In the aftermath of the US advance, the Japanese troops began concentrating between Paraso Bay and Mundi Mundi. Meanwhile, there were 121 Japanese air raids on Vella Lavella between 15 August and 6 October. The Marine 4th Defense Battalion provided defensive support during this timeGillespie, The Pacific, p. 126. and claimed to have shot down 42 Japanese aircraft.Shaw and Kane, Isolation of Rabaul, p. 157
Relief by New Zealand troops In mid-September, the Americans were relieved by New Zealanders from Major General Harold Barrowclough's 3rd Division.Crawford, Kia Kaha, p. 150. The New Zealand 14th Brigade, consisting of around 3,700 men under Brigadier Leslie Potter,Gillespie, The Pacific, p. 127. used a series of amphibious operations and cross-country marches to advance through the coastal areas, bounding from bay to bay and then clearing each area with patrols. Two infantry battalions, the 35th and 37th, each allocated eight landing craft, conducted a pincer movement to trap the 600-strong Japanese garrison, while the 30th Infantry Battalion was held in reserve around the main concentration of troops in the south of the island.Gillespie, The Pacific, p. 130.
Departing from Maravari Beach on 21 September, the New Zealanders established their forward areas around Matu Soroto and Boro and then began their advance on 25 September. Over the course of ten days, the New Zealanders fought a series of minor actions as the 35th Infantry Battalion advanced up the western coast and the 37th moved up the east. During the advance, the terrain prevented the use of armour, while artillery had to be moved by landing craft and dragged ashore to support the infantry, which struggled to advance through the thick jungle amidst torrential rain. Progress was slow, and initially combat was confined to skirmishes against small groups of Japanese hiding in well concealed jungle positions.Gillespie, The Pacific, pp. 130–132.
The 35th Battalion advanced to Pakoi Bay and then pushed overland towards Timbala Bay, where they planned to attack the main Japanese garrison which was withdrawing on both fronts. In doing so, several patrols were pushed forward to block suspected Japanese withdrawal routes towards Marquana Bay. These patrols were subsequently ambushed and cut off, after which two platoons were dispatched to rescue them. These also came up against strong opposition and forced to turn back and the decision was made to wait for the 37th Battalion to join the 35th before attacking. While they waited, further patrols were sent out and the ambushed patrols fought their way out from Japanese lines, having inflicted heavy casualties and were subsequently rescued by barge.Gillespie, The Pacific, pp. 133–136.