World War II Timeline By AngeK15 Sep 1, 1939 War is announced on Germany Period: Sep 1, 1939 to Sep 2, 1945 WWII TIMESPAN Jan 1, 1940 The Battle of Britain. Germany suffers its first defeat. Jan 1, 1940 Germany invades Denmark, Norway, France, the Netherlands, Belgium and Luxembourg Jan 1, 1940 Germany invades Poland Jun 10, 1940 Italy enters war Dec 7, 1941 Imperial Japansese Navy attacks Pearl Harbour America enters the war. Dec 8, 1941 US joins the war Oct 1, 1942 Battle of Stalingrad Germany's entire sixth army is lost. Apr 30, 1945 Hitler commits suicide May 7, 1945 Germany surrenders to Western Allies May 8, 1945 Germany surrenders to Soviet Union Aug 1, 1945 US drops an atomic bomb on Nagasaki and Hiroshima. Sep 2, 1945 War is officially over.
