Aggression and War in the Pacific By nal Sep 19, 1931 Japan Invades Manchuria Dec 7, 1937 Japan brutally attacks Nanking for 6 weeks. Sep 1, 1941 Japan Invades French Indochina Dec 7, 1941 Japan attacks Pearl Harbor Apr 9, 1942 Japan forforces 78,000 POW's to march 65 miles. 2/3 Die