Events Leading Up to D-Day By HCBsoccer2020 Sep 1, 1939 Hitler's armies invaded Poland. Poland surrendered quickly. May 10, 1940 Germany invaded Beljium. This split the British and Freanch Armies. Jul 10, 1940 The Battle of Britian began. Jun 6, 1944 D-day: The beggining of the end of Hitler's Germany. Sep 1, 1944 General Montgomery was promoted to field marshal. Oct 14, 1944 Erwin Rommel commited suicide. Apr 30, 1945 Hitler died.