WWII By s06849 Jul 7, 1937 Marco Polo Bridge Incident One of the date mentioned as the beginning of World War II. Sep 1, 1939 Germany invaded Poland The Polish army was defeated within weeks of the invasion. May 10, 1940 Germany Invades France, Belgium and Holland, and western Europe Feb 15, 1942 The Fall of Singapore Singapore surrendered to the Japanese. May 7, 1945 Russians reach Berlin Hitler commits suicide and Germany surrenders on 7 May.