WW2: 10 Most Important Events By Isaiah_Cabreja_Choose a username Period: Sep 1, 1939 to Sep 2, 1945 The start of WW2 Germany invades poland Period: Dec 16, 1944 to Jan 25, 1945 Battle of the Budge This was a warThe Germans launch a large attack in the Battle of the Bulge. They lose to the Allies sealing the fate of the German army.