World War II Timeline By MilliganAshlin Sep 28, 1939 Germany and Soviet Union Divide Poland Apr 9, 1940 Blitzkreig Against Denmark and Norway May 1, 1940 Winston Churchhill becomes Prime Minister of Great Britian May 9, 1940 Blitzkreig on the Netherlands and France Jun 22, 1940 The French signed armistice Period: Jul 10, 1940 to Oct 31, 1940 Battle of Britian Jun 22, 1941 Hitler Invaded the Soviet Union Dec 1, 1941 Soviet Counterattack Hitler Dec 7, 1941 Pearl Harbor May 7, 1942 Battle of the Coral Sea Period: Nov 1, 1942 to Feb 2, 1943 Soviet counter attack on Germany