The Soviet Union continued combat operations against Japan until early September 1945. During the Invasion of the Kuril Islands, Soviet forces landed on Shumshu on 18 August 1945, beginning the Battle of Shumshu, one of the last battles of World War II. Combat operations continued through 23 August 1945, ending with the surrender of the surviving members of the Japanese garrison. The Soviets sent the Japanese prisoners of war, including most Japanese male civilians, to labor camps and forcibly deported the remaining Japanese civilian inhabitants. The Soviets renamed Kataoka Baikovo (), and the Soviet Union annexed the island in 1946, including it in the Russian Soviet Federated Socialist Republic. Japan formally gave up sovereignty over the island under the terms of the San Francisco Peace Treaty of 1951.