World War 2 By gilberttimothy Sep 1, 1939 Germany invades Poland Sep 1, 1939 The first day of the war. Sep 3, 1939 Great Britian and France declare war on Germany. Apr 9, 1940 Germany invades Denmark and Norway Denmark surrenders on the day of the attack; Norway holds until June. Dec 7, 1941 Japan bombs Pearl Harbor Oct 20, 1944 US troops land in the Philippines Mar 7, 1945 US troops cross the Rhine River at Remegen Apr 16, 1945 The Soviets launch their final offensive, encircling Berlin