On December 12, the Japanese Navy proposed that Guadalcanal be abandoned. Despite opposition from Japanese Army leaders, who still hoped that Guadalcanal could eventually be retaken from the Allies, on December 31, 1942 Japan's Imperial General Headquarters, with approval from the Emperor, agreed to the evacuation of all Japanese forces from the island and the establishment of a new line of defense for the Solomons on New Georgia. The Japanese evacuated their remaining forces from Guadalcanal over three nights between February 2 and February 7, 1943, conceding the hard-fought campaign to the Allies. Building on their success at Guadalcanal and elsewhere, the Allies continued their campaign against Japan, ultimately culminating in Japan's defeat and the end of World War II.