Japanese occupation of Attu

The Japanese occupation of Attu was the result of an invasion of the Aleutian Islands during World War II. Imperial Japanese Army troops landed on 6 June 1942 at the same time as the invasion of Kiska. The occupation ended with the Allied victory in the Battle of Attu on 30 May 1943.

Occupation
In May 1942, the Japanese began a campaign against Midway, their objective being to occupy the islands and destroy the remaining United States Navy forces in the Pacific. In order to deceive the American Pacific Fleet, a diversionary attack was ordered to take place in the Aleutians, thus beginning the Aleutian Islands Campaign. During the Battle of Midway, Japanese forces were repulsed in a decisive action, meanwhile on 6 June, Japanese naval forces under Boshirō Hosogaya landed troops unopposed at Kiska and Attu islands. A force consisting of 1,140 infantry under Major Matsutoshi Hosumi took control of the island and captured forty-five Aleut civilians and a school teacher. The school teacher's husband was killed during the invasion; the Japanese Army was suspected of executing him. All of the prisoners were eventually removed to Japan.

After landing, the soldiers began constructing an airbase and fortifications. The nearest American forces were on Unalaska Island at Dutch Harbor and at an airbase on Adak Island. Throughout the occupation, American air and naval forces bombarded the island. Initially the Japanese intended to hold the Aleutians only until the winter of 1942; however, the occupation continued into 1943 in order to deny the Americans use of the islands. In August 1942, the garrison of Attu was moved to Kiska to help repel a suspected American attack. From August to October 1942, Attu was unoccupied until a 2,900-man force under Colonel Yasuyo Yamasaki arrived. The new garrison of Attu continued constructing the airfield and fortifications until 11 May 1943, when a 15,000 man army of American troops landed. On 12 May, JAPANESE SUBMARINE I-31 was forced to surface five miles northeast of Chichagof Harbor, she was then sunk in a surface engagement with USS Edwards (DD-619).

Allied forces under General John L. DeWitt took control of the island on 30 May after the remaining Japanese troops conducted a massive banzai charge. American forces lost 549 killed and 1,148 wounded, another 2,100 evacuated due to weather related injuries. During the Battle of Attu, all but 29 men of the Japanese garrison were killed. The occupation ended with the Allied victory and American forces used the Japanese-built airfield to launch bomber attacks against the Japanese home islands.