The Empire of Japan had largely achieved its objectives in the Pacific region in the spring of 1942, with almost the entire area between Burma and the Bismarck Archipelago under Japanese control. Further Japanese offensives against the Allied lines were planned to force them into a single decisive battle and then request negotiations for their surrender. The initial Japanese offensive failed during the Battle of Midway in June 1942 and subsequently the Japanese attempt to also capture Port Moresby in New Guinea collapsed, ending the Japanese offensive run in the Pacific theater of operations for the rest of the war. The allies in the South Pacific began their first counter-offensive against the Japanese-held island Guadalcanal in August 1942 and the Japanese forces were forced onto the defensive.
To keep the Japanese cowed and begin the Allied advance towards the Japanese home islands, the Allied military leadership envisaged an advance through the Pacific over two main lines of attack. Admiral Chester W. Nimitz would lead Allied forces in the Pacific and General Douglas MacArthur would advance Allied operations against the Japanese in the Southwest Pacific. Landings along the coast of New Guinea were planned which constituted the first step towards a return to the Philippines and the conquest of the Gilbert Islands. The operation in New Guinea was known as Operation Cartwheel which began on 30 June 1943 with the objective to conquer New Guinea, the Bismarck Archipelago and Rabaul. Until mid-September 1943, the fighting focused on the eastern part of New Guinea, while a decision was made on 22 September 1943 to land in West New Britain.
Operation Dexterity was to be conducted in three separate phases:
Operation Lazaretto – Planned landing in southern New Britain at the plantation of Lindenhafen, approximately 5km from Gasmata on 14 November 1943 and the neutralization of Japanese base at Gasmata for protection of eastern flank for the subsequent operation. This operation was never undertaken and replaced by Operation Director.
Operation Backhander – Landing in northwestern New Britain at Cape Gloucester to capture local Japanese airfields and convert them into a major Allied airbase.
After the successful conclusion of these three phases the Allies landed at Talasea to try to cut off the thousands of retreating Japanese troops under the command of Major General Iwao Matsuda who successfully escaped to defensive lines in central New Britain after the small force of Japanese defenders delayed the Marines from quickly advancing to the withdrawal route.
Geography and Environment
An American M4 Sherman advances through rainforest during Operation Dexterity
Like most of the islands of the South Pacific, the Islands of the Bismarck Archipelago are of volcanic origin with steep mountain slopes, jungle and treacherous marshes, where malaria was a problem for all deployed troops. The hot, tropical climate was rarely ameliorated by the torrential rain storms and dense clouds which afflicted the region. The inhabited islands had been managed by Australia as a League of Nations Mandate before the war, and there was only a settlement of Westerners originally settled by Imperial Germany before the First World War that was centered on coconut plantations and missionary complexes.
The Japanese on New Britain
General Hitoshi Imamura, Commander of 8th Area Army in Rabaul
The high command of the 8th Area Army of the Japanese Imperial Army in Rabaul controlled the Japanese actions in the Solomon Islands, New Guinea and the Bismarck Islands. In January 1942, the Japanese had taken the strategically important port of Rabaul in northeastern New Britain and in subsequent months the largest and most important Japanese naval and air base in the Pacific was constructed at that location. The 8th Area Army was commanded by General Hitoshi Imamura who had at his disposal nearly 200,000 men. In early 1943, the Japanese leadership had expected that the Allies would attempt to break the inner Japanese defensive belt in the Pacific and attack the bases on New Guinea, the Mariana Islands, Palau and the Philippines. General Imamura therefore foresaw an attack on New Britain, at the latest after the Allies had occupied New Ireland, which was expected in February or March 1944.
The 8th Area Army relied exclusively on barge and submarine traffic from Rabaul to New Guinea, because of Allied air superiority. In September 1943, Major General Iwao Matsuda took over the 65th Brigade, the various pioneers and debarkation units, and a number of troops of the 51st Division, whose main units were on New Guinea in the fight against Australian troops. Two companies of 115th Division and provisional infantry companies formed from artillery and engineer elements of the 66th Division, and about half of the 51st Reconnaissance Regiment belonged to General Matsuda's command. General Matsuda, a highly experienced officer, established his headquarters near the airfield of Cape Gloucester. On 5 October 1943, all of Matsuda's units came under the command of the 17th Division which was commanded by Lieutenant General Yasushi Sakai, who had arrived in December 1943 from the Japanese theater of operations in China.
Lieutenant General Yasushi Sakai, Commander of 17th Division
General Sakai set up his headquarters at Malalia in the vicinity of Cape Hoskins on the East Williaumez Peninsula. The 17th Division's troops began immediately ordering the expansions of the defensive lines. The Japanese headquarters was established in an existing concrete bunker at the foot of Talawe Mountain, which was surrounded by dense, tropical vegetation. Smaller bunkers and shelters for machine gun positions were sited at possible Allied landing beaches five miles southeast of Cape Gloucester. Two hills known later as Target-Hill and Hill 660 served as focal points for the Japanese defenses. Thus about half of all available Japanese troops in the west of the island were in positions that could effectively contribute to the defense of Cape Gloucester.
On 12 December 1943, General Yasushi Sakai advised all commanders of his units about an imminent Allied invasion. The large volumes of Allied landing ships along the ports of New Guinea did not convince the Japanese of the scheduled operations of Allied forces. False invasion alarms were commonplace up to the end of 1943. With the Allies' air superiority increasing, the bombing of Rabaul and Wewak brought the realization that the invasion of New Britain was imminent.
Preparatory actions
Reconnaissance
Two days after the decision to proceed with the operation was taken by the Allied commanders, the US 6th Army's Alamo Scouts began to deploy in the area of Cape Gloucester. They neared the coast by torpedo boat, then transferred to dinghies and landed on the beaches. From there they reconnoitered the Japanese defenses by direct observations or through contact with the local aboriginal population of New Britain.
Bases of the Japanese and allied in December 1943General Krueger with Alamo Scouts
Operation Cartwheel (1943–1944) was a major military operation for the Allies in the Pacific theatre of World War II. Cartwheel was an operation aimed at neutralising the major Japanese base at Rabaul. The operation was directed by the Supreme Allied Commander in the South West Pacific Area (SWPA), General Douglas MacArthur, whose forces had advanced along the northeast coast of New Guinea and occupied nearby islands. Allied forces from the South Pacific Area, under Admiral William Halsey, advanced through the Solomon Islands toward Bougainville. The Allied forces involved were from Australia, the Netherlands, New Zealand, the US and various Pacific Islands.
The Battle of the Bismarck Sea took place in the South West Pacific Area (SWPA) during World War II when aircraft of the U.S. Fifth Air Force and the Royal Australian Air Force (RAAF) attacked a Japanese convoy carrying troops to Lae, New Guinea. Most of the Japanese task force was destroyed, and Japanese troop losses were heavy.
The Battle of Rabaul, also known by the Japanese as Operation R, an instigating action of the New Guinea campaign, was fought on the island of New Britain in the Australian Territory of New Guinea, from 23 January into February 1942. It was a strategically significant defeat of Allied forces by Japan in the Pacific campaign of World War II, with the Japanese invasion force quickly overwhelming the small Australian garrison, the majority of which was either killed or captured. Hostilities on the neighbouring island of New Ireland are usually considered to be part of the same battle. Rabaul was significant because of its proximity to the Japanese territory of the Caroline Islands, site of a major Imperial Japanese Navy base on Truk.
The New Georgia campaign was a series of land and naval battles of the Pacific campaign of World War II between Allied forces and the Empire of Japan. It was part of Operation Cartwheel, the Allied strategy in the South Pacific to isolate the Japanese base around Rabaul. The campaign took place in the New Georgia group of islands, in the central Solomon Islands and followed the Allied capture of the Russell Islands. The main fighting took place on New Georgia island itself, although significant actions also took place around the island chain throughout the campaign.
The Bougainville campaign was a series of land and naval battles of the Pacific campaign of World War II between Allied forces and the Empire of Japan, named after the island of Bougainville. It was part of Operation Cartwheel, the Allied grand strategy in the South Pacific. The campaign took place in the Northern Solomons in two phases. The first phase, in which American troops landed and held the perimeter around the beachhead at Torokina, lasted from November 1943 through November 1944.
The Solomon Islands campaign was a major campaign of the Pacific War of World War II. The campaign began with Japanese landings and occupation of several areas in the British Solomon Islands and Bougainville, in the Territory of New Guinea, during the first six months of 1942. The Japanese occupied these locations and began the construction of several naval and air bases with the goals of protecting the flank of the Japanese offensive in New Guinea, establishing a security barrier for the major Japanese base at Rabaul on New Britain, and providing bases for interdicting supply lines between the Allied powers of the United States and Australia and New Zealand.
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 and the Australian Territory of Papua and overran western New Guinea, which was a part of the Netherlands East Indies. During the second phase, lasting from late 1942 until the Japanese surrender, the Allies—consisting primarily of Australian forces—cleared the Japanese first from Papua, then the Mandate and finally from the Dutch colony.
The New Britain campaign was a World War II campaign fought between Allied and Imperial Japanese forces. The campaign was initiated by the Allies in late 1943 as part of a major offensive which aimed to neutralise the important Japanese base at Rabaul, the capital of New Britain, and was conducted in two phases between December 1943 and the end of the war in August 1945.
The Battle of the Green Islands or Operation Squarepeg was fought from 15 to 20 February 1944, between Imperial Japan and Allied forces from the New Zealand 3rd Division and the United States. Undertaken after landings to secure lodgments on New Britain and Bougainville, the main focus of the operation was the capture of Nissan Island, which was secured by New Zealand forces after only a short ground campaign. At only very limited cost in terms of casualties, the Allied operation resulted in the capture of several small atolls in the island chain, which were subsequently used to support air and naval operations focused on reducing the main Japanese base on Rabaul.
The Battle of Cape Gloucester was fought in the Pacific theater of World War II between Japanese and Allied forces on the island of New Britain, Territory of New Guinea, between 26 December 1943 and 16 January 1944. Codenamed Operation Backhander, the US landing formed part of the wider Operation Cartwheel, the main Allied strategy in the South West Pacific Area and Pacific Ocean Areas during 1943–1944. It was the second landing the US 1st Marine Division had conducted during the war thus far, after Guadalcanal. The objective of the operation was to capture the two Japanese airfields near Cape Gloucester that were defended by elements of the Japanese 17th Division.
The Battle of Vella Lavella was fought from 15 August – 6 October 1943 between 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 fighting around 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.
The Battle of Arawe was fought between Allied and Japanese forces during the New Britain campaign of World War II. The battle formed part of the Allied Operation Cartwheel, and had the objective of serving as a diversion before a larger landing at Cape Gloucester in late December 1943. The Japanese military was expecting an Allied offensive in western New Britain, and was reinforcing the region at the time of the Allied landing in the Arawe area on 15 December 1943. The Allies secured Arawe after about a month of intermittent fighting with the outnumbered Japanese force.
The 17th Division was an infantry division in the Imperial Japanese Army. Its tsūshōgō code name was the Moon Division. The 17th Division was one of two infantry divisions raised by the Imperial Japanese Army immediately after the Russo-Japanese War (1904–1905). The division received its colors on 13 November 1907. Its original headquarters was in a suburb of the city of Okayama, and its troops were recruited primarily from communities in the three prefectures of Okayama, Hiroshima, and Shimane. The first commander of the division was Lieutenant General Ichinohe Hyoe.
The Landings at Cape Torokina, also known as Operation Cherryblossom, took place at the beginning of the Bougainville campaign in World War II. The amphibious landings were carried out by elements of the United States Marine Corps in November 1943 on Bougainville Island in the South Pacific, as part of Allied efforts to advance towards the main Japanese base around Rabaul under Operation Cartwheel. Coming in the wake of Allied successes at Guadalcanal and in the central Solomons, the landings were intended to secure a beachhead with the purpose of establishing several bases from which to project air and naval power closer towards Rabaul, in an effort to neutralize the large Japanese force that had been established there.
The landing at Saidor, codenamed Operation Michaelmas, was an Allied amphibious landing at Saidor, Papua New Guinea on 2 January 1944 as part of Operation Dexterity during World War II. In Allied hands, Saidor was a stepping stone towards Madang, the ultimate objective of General Douglas MacArthur's Huon Peninsula campaign. The capture of the airstrip at Saidor also allowed construction of an airbase to assist Allied air forces to conduct operations against Japanese bases at Wewak and Hollandia. But MacArthur's immediate objective was to cut off the 6,000 Imperial Japanese troops retreating from Sio in the face of the Australian advance from Finschhafen.
The Battle of Wide Bay–Open Bay was a battle during the New Britain campaign of the Second World War. Following the arrival of the Australians on New Britain in late 1944, replacing the US garrison on the island, they began a limited offensive against the Japanese forces on the island. Pushing east from the positions previously captured by the US troops earlier in the year, after landing at Jacquinot Bay on the southern coast in November, the Australians began advancing across the island towards the Gazelle Peninsula, where they sought to isolate the numerically superior Japanese garrison. This advance was effected along two axes: Cape Hoskins to Open Bay on the northern coast, and Jacquinot Bay to Wide Bay on the southern. Once the Australians had secured a line across the island between Wide Bay and Open Bay in March and April 1945, the fighting on New Britain died down as the Australians sought to contain the larger Japanese garrison while limiting their own casualties. This situation lasted until the end of the war in August 1945.
The Landing at Jacquinot Bay was an Allied amphibious operation undertaken on 4 November 1944 during the New Britain Campaign of World War II. The landing was conducted as part of a change in responsibility for Allied operations on New Britain. The Australian 5th Division, under Major General Alan Ramsay, took over from the US 40th Infantry Division, which was needed for operations in the Philippines. The purpose of the operation was to establish a logistics base at Jacquinot Bay on the south coast of New Britain to support the 5th Division's planned operations near the major Japanese garrison at Rabaul.
Iwao Matsuda was a general in the Imperial Japanese Army, commanding Japanese ground forces in the Southwest Pacific during the closing months of World War II.
Rabaul is a town in Eastern New Britain, Papua New Guinea. Japanese forces landed on Rabaul on 23 February 1942, capturing it in February of that year. The former Australian territory was transformed into a major Japanese naval and air installation. The Japanese heavily relied on it, and used it as a launching point for Japanese reinforcements to New Guinea and Guadalcanal. Throughout the Solomons Campaign, neutralizing Rabaul became the primary objective of the Allied effort in the Solomons.
The Battle of Talasea was a battle fought in the Pacific theater of World War II between Japanese and Allied forces. Dubbed "Operation Appease" by the Allies, the battle was part of the wider Operations Dexterity and Cartwheel, and took place on the island of New Britain, Territory of New Guinea, in March 1944 as primarily US forces, with limited Australian support, carried out an amphibious landing to capture the Talasea area of the Willaumez Peninsula, as part of follow up operations as the Japanese began withdrawing east towards Rabaul following heavy fighting around Cape Gloucester earlier in the year. The assault force consisted of a regimental combat team formed around the 5th Marines, which landed on the western coast of the Willaumez Peninsula, on the western side of a narrow isthmus near the Volupai Plantation. Following the initial landing, the Marines advanced east towards the emergency landing strip at Talasea on the opposite coast. Their advance south was stymied by a small group of Japanese defenders who prevented the US troops from advancing quickly enough to cut off the withdrawal of the Japanese force falling back from Cape Gloucester.
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