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 campaign resulted in a crushing defeat and heavy losses for the Empire of Japan. As in most Pacific War campaigns, disease and starvation claimed more Japanese lives than enemy action. Most Japanese troops never even came into contact with Allied forces and were instead simply cut off and subjected to an effective blockade by Allied naval forces. Garrisons were effectively besieged and denied shipments of food and medical supplies, and as a result some claim that 97% of Japanese deaths in this campaign were from non-combat causes. According to John Laffin, the campaign "was arguably the most arduous fought by any Allied troops during World War II".
The struggle for New Guinea began with the capture by the Japanese of the city of Rabaul at the northeastern tip of New Britain in January 1942. Rabaul overlooks Simpson Harbour, a considerable natural anchorage and was ideal for the construction of airfields. Over the next year, the Japanese built up the area into a major air and naval base. The Allies responded with multiple bombing raids on Rabaul as well as action off Bougainville.
The Japanese Eighth Area Army, under General Hitoshi Imamura at Rabaul, was responsible for both the New Guinea and Solomon Islands campaigns. The Japanese 18th Army, under Lieutenant General Hatazō Adachi, was responsible for Japanese operations on mainland New Guinea.
The colonial capital of Port Moresby on the south coast of Papua was the strategic key for the Japanese in this area of operations.
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