American forces then began preparing to move against nearby Kiska island, termed Operation Cottage, the final fight in the Aleutian Islands Campaign. In August 1943, elements of the 7th Infantry Division took part in an amphibious assault on Kiska with a brigade from the 6th Canadian Infantry Division, only to find the island deserted by the Japanese. It was later discovered that the Japanese had withdrawn their 5,000-soldier garrison during the night of 28 July, under cover of fog.