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The Bougainville Campaign (Operation Cherry Blossom) 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 grand strategy in the South Pacific. The campaign took place in the Northern Solomons in two phases: the first phase, in which American troops invaded and held the Perimeter around the beachhead, lasted from November 1943 through November 1944; the second phase, in which British Commonwealth troops attempted to mop up pockets of starving, isolated but still-determined Japanese, lasted from November 1944 until August 1945, when the last Japanese on the island surrendered. ==Japanese occupation== Before the war, Bougainville had been administered as part of the Australian Territory of New Guinea, even though, geographically, Bougainville is part of the Solomon Islands chain. The United Kingdom and Germany had traded it for another islands territory which became British rather than German. As a result, the campaign is referred to as part of both the New Guinea and the Solomon Islands campaigns. During their occupation the Japanese constructed naval aircraft bases in the north, east, and south of the island; but none in the west. They developed a naval anchorage at Tonolei Harbor near Buin, their largest base, on the southern coastal plain of Bougainville. On the nearby Treasury and Shortland Islands they built airfields, naval bases and anchorages. These bases helped protect Rabaul, the major Japanese garrison and naval base in Papua New Guinea, while allowing continued expansion to the south-east, down the Solomon Islands chain, to Guadalcanal. In March–April 1942, the Japanese landed on Bougainville as part of their advance into the South Pacific. At the time, there was only a small Australian garrison on the island which consisted of about 20 soldiers from the 1st Independent Company and some coastwatchers. Shortly after the Japanese arrived, the bulk of the Australian force was evacuated by the Allies, although some of the coastwatchers remained behind to provide intelligence.〔(【引用サイトリンク】 url = http://www.ww2australia.gov.au/lastbattles/shadows.html )〕 Once secured, the Japanese began constructing a number of airfields across the island.〔Keogh 1965, p. 414.〕 The main airfields were on Buka Island, the Bonis Peninsula in the north, at Kahili and Kara, in the south, and Kieta on the east coast,〔 while a naval anchorage was constructed at Tonolei Harbor near Buin on the southern coastal plain, along with anchorages on the Shortland Islands group.〔Murray 2001, p. 169–195, Spector 1985, pp. 152–153〕 The airfield at Kahili was known by the Japanese as Buin Airfield,〔(【引用サイトリンク】title=Kahili Airfield (Buin Airfield) )〕 and to its south was an airfield on Ballale Island in the Shortland Islands. These bases allowed the Japanese to conduct operations in the southern Solomon Islands and to attack the Allied lines of communication between the United States, Australia and the Southwest Pacific Area.〔 At the opening of the Allied offensives, estimates of Japanese strength on Bougainville varied widely, ranging between 45,000 to 65,000 Army, Navy, and labour personnel.〔Rottman 2005, pp. 70–72; Gailey, 1991, p. 211 and Long 1963, pp. 102–103〕 These forces constituted the Japanese 17th Army, commanded by General Harukichi Hyakutake. Hyukatake reported to General Hitoshi Imamura, commander of the Japanese Eighth Area Army, headquartered at Rabaul on New Britain Island. Naval command at Rabaul was the responsibility of Vice Admiral Jinichi Kusaka, commander Southeast Area Fleet. The level of cooperation between these two officers was greater than that usually found between the branches of the Japanese armed forces.〔Morison 1958, p. 394〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bougainville Campaign」の詳細全文を読む スポンサード リンク
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