Adak Island has been the home to Aleut peoples since ancient times. Russian explorers in the 18th century also visited the island but made no permanent settlements. During World War II, the Imperial Japanese Army took control of two of the westernmost Aleutian Islands—Attu and Kiska—in the incorporated territory of Alaska, the first foreign enemy to occupy American soil since the War of 1812. The Japanese also attacked the American base at Dutch Harbor by air. The Japanese campaign coincided with the more well-known Battle of Midway. In response, the United States military began a campaign to oust the Japanese. Since the nearest U.S. military presence was in Cold Bay, Alaska, the U.S. began to construct bases in the western Aleutian Islands from which to launch operations against the Japanese. Adak Island was chosen as the site of an airfield, and flight operations began in September 1942. On May 11, 1943, four days after the initial invasion date was delayed by bad weather, American soldiers landed on Attu Island and defeated the Japanese garrison there, at the cost of 2,300 Japanese and 550 American lives. Expecting a similar battle for Kiska Island, U.S. and Allied soldiers landing there August 15, 1943, found the occupiers had been stealthily evacuated by Japanese naval forces since the end of May, 1943. Even so, over 313 Allied soldiers died from friendly fire, mines, and other anti-personnel devices during Allied operations to take back Kiska. In 1953, remains of 236 Japanese dead who had been buried in Adak Cemetery were reburied in Japan's Chidorigafuchi National Cemetery.