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Manus Island is the largest Island in the Admiralty Island Group (Admiralty Islands) surrounded by the Bismarck Sea. To the east is Los Negros Island. Today located in Manus Province in Papua New Guinea (PNG).
On April 5, 1942, Japanese forces landed on Manus and established a relatively small base on Manus and had minimal contact with the people of Manus, aside from hiring villagers from Rossum as guides and scouts. The locals were told by the Japanese that "the war was a fight amongst outside nations and the local people were best advised to stay in the safely of the hinterland." German colonist who remained on the island when then Japanese arrived were either killed or imprisoned.
On March 25, 1944 US Army troops landed on Manus and met sporadic resistance that was quickly overcome. Immediately, Seadler Harbor was developed into a huge US Naval anchorage with shore facilities built at Lorengau and Lombrum. This base was a staging area for future operations in Dutch New Guinea and later the Philippines. Thousands of buildings, shops and sheds were erected. At Lorengau, supply and repair facilities were created. Wharves were constructed in the harbor. Almost overnight, the Americans had built one of the largest aerodromes and harbors in the entire Pacific region.
In the years after the Pacific War, harvesting timber in the vicinity was dangerous because of shrapnel and bullets still lodged into the trees around the battlefield areas.
Lorengau located on the northeast coast of Manus Island
Rossum (Rossun) located on the northeast coast of Manus Island
Seeadler Harbor borders Manus Island Harbor on November 10, 1944 explosion of USS Mt. Hood AE-11
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