The Battle of Biak was a hard-fought Allied campaign during May and June 1944 to recapture the island of Biak, off the north coast of New Guinea, from the Japanese who were using it as an air base. American and Australian troops attacked the island on the 27th of May 1944. The Japanese garrison put up strong resistance and the island was not secured until the 29th of June, with 2,700 Allied casualties and 9,000 Japanese. Research Battle of Biak