World War II By patrick.taylor Apr 13, 1935 Germany INvades Poland - - Sep 1, 1939 Soviet Leader outbreak of World War II 1939, outbreak of World War II Apr 9, 1940 April 9, 1940-41 Germany invaded Norway Jun 22, 1941 Operation Barbarossa Dec 7, 1941 Pearl Harbor Dec 7, 1942 World War II in the Pacific 1941-42