Important Events of WW2 By mclelland.7 Sep 1, 1939 German Invasion of Poland Sep 3, 1939 England (Great Britain), and France declare war on Germany Apr 6, 1940 Germany invades Greece & Yugoslavia Jun 22, 1940 Germany invades U.S.S.R. Jul 10, 1940 Battle of Britain Dec 8, 1941 USA declares war on Japan after Pearl Harbor attack Dec 11, 1941 Germany/Italy declare war on USA Feb 4, 1944 Yalta Conference Jun 6, 1944 D-Day Aug 25, 1944 Paris liberated Dec 16, 1944 Battle of the Bulge May 7, 1945 Germany Surrenders, End of WW2