WWII Pacific Key dates By dalejosh Dec 7, 1941 Japan attacks Pearl Harbour Dec 8, 1941 USA At war with Japan Feb 11, 1942 Singapore Falls. Japan attacks Darwin May 11, 1942 Sydney attacked by Japanese Jul 11, 1942 Japan invade Buna and Gona in New Guinea. Aug 11, 1942 Japanese captured Kokoda. Nov 11, 1942 Australian recapture Kokoda Aug 6, 1945 USA drops Atomic bomb on Hiroshima Aug 8, 1945 USA drops 2nd bomb on Nagasaki. Sep 2, 1945 Japan surrenders. WW2 is over.