World War II Timeline by Ryan Grossfeld By grossfeldrm Sep 1, 1939 Germany Invades Poland, Inciting World War II Sep 3, 1939 France and Britain Declare War on Germany Apr 9, 1940 Germany Invades Denmark and Norway May 10, 1940 Germany Invades Western Europe Jun 21, 1940 Italy Invades Southern France Jul 10, 1940 Battle of Britain Begins Oct 28, 1940 Italy Begins to Invade Greece Oct 31, 1940 Germany Loses the Battle of Britain Nov 20, 1940 (20)Hungary, (22)Romania, and (23)Slovakia Join the Axis Powers Apr 6, 1941 Germany Invades Yugoslavia and Greece Jun 22, 1941 Germany Invades the Soviet Union Aug 3, 1941 Euthanasia Program is Announced by a Bishop in Muenster Dec 6, 1941 Soviet Counteroffensive Drive Germany out of Moscow Dec 7, 1941 Japan Bombs Pearl Harbor Dec 8, 1941 The United States Declare War on Japan Dec 11, 1941 Germany Declares War on the United States Jan 20, 1942 Wannsee Conference Held Near Berlin, Germany Mar 27, 1942 Germans Begin Deportation of Jews from the East to Auschwitz Jun 28, 1942 Germany Launches New Offensive Towards Stalingrad May 13, 1943 Axis Forces Surrender to the Allies in Tunisia Jul 25, 1943 The Fascist Council Replaces Mussolini with Badoglio Jan 22, 1944 Allied Troops Successfully Land in Anzio, Just South of Rome May 7, 1945 Germany Surrenders to the Western Allies May 9, 1945 Germany Surrenders to the Soviets Sep 2, 1945 Japan Formally Surrenders to the United States