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 main landing came on 26 December 1943, when US Marines landed on either side of the peninsula. The western landing force acted as a diversion and cut the coastal road near Tauali to restrict Japanese freedom of movement, while the main force—landing on the eastern side—advanced north towards the airfields. The advance met light resistance at first but was slowed by the swampy terrain which channeled the US troops onto a narrow coastal trail. A Japanese counterattack briefly slowed the advance, but by the end of December the airfields had been captured and consolidated by the marines. Fighting continued into early January 1944 as the marines extended their perimeter south from the airfields towards Borgen Bay. Organized resistance ceased on 16 January 1944 when marines captured Hill 660; however, mopping up operations in the vicinity continued into April 1944 until the marines were relieved by US Army forces.
Cape Gloucester is a headland that sits on the northern peninsula at the west end of the island of New Britain, which lies to the northeast of mainland New Guinea. It is roughly opposite to the Huon Peninsula, from which it is separated by Rooke Island with the intervening sea lane divided into the Vitiaz and Dampier Straits. At the time of the battle it was part of the Territory of New Guinea. It is west of Rabaul and northeast of Port Moresby.
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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. Initial fighting on New Britain took place around the western end of the island in December 1943 and January 1944, with US forces landing and securing bases around Arawe and Cape Gloucester.
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 Territory of New Guinea on 23 January and Territory of Papua on 21 July and overran western New Guinea (part of the Netherlands East Indies) beginning on 29 March. 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 New Guinea, and finally from the Dutch colony.
The Territory of New Guinea was an Australian-administered United Nations trust territory on the island of New Guinea from 1914 until 1975. In 1949, the Territory and the Territory of Papua were established in an administrative union by the name of the Territory of Papua and New Guinea. That administrative union was renamed as Papua New Guinea in 1971. Notwithstanding that it was part of an administrative union, the Territory of New Guinea at all times retained a distinct legal status and identity until the advent of the Independent State of Papua New Guinea.