Alaska's strategic importance to the United States became more apparent during World War II. In April 1942, over 200 people of Japanese origin in the territory were forcibly removed and sent to internment camps inland as a result of Executive Order 9066, which authorized the government to evict and intern any person of Japanese descent from the Pacific Coast. From June 1942 until August 1943 the Japanese invaded the U.S. by way of the Aleutian Islands chain, in the Battle of the Aleutian Islands. This marked the first time since the War of 1812 that American soil was occupied by a foreign enemy. The Japanese were eventually repelled from the Aleutian Islands by a force of 34,000 American troops.