The U.S. amphibious attack on Kiska began the night of August 15. The soldiers expected enemy fire, but they were greeted by only silence as they scrambled ashore in heavy, unrelenting fog. On August 16, the second half of the powerful invasion force came ashore on the northern part of Kiska, again to a deserted island. The Japanese had left under cover of night, fog, and storm two weeks earlier. At noon on August 17, Major General Corlett conceded that the enemy was really gone, leaving great stores of supplies. Nevertheless, Allied forces suffered 313 casualties including friendly fire, land and naval mines, and car accidents in foggy conditions. This phantom battle marked the end of the Japanese occupation of American soil and its only campaign in the Western Hemisphere.