War Begins. In the early hours of Friday, September 1, 1939, the German armies stormed across the Polish frontierwithout a declaration of war. The Free City of Danzig (the presentday city of Gdansk, Poland, which was then an independent territory) was proclaimed a German city by Nazi agitators in the city. Two days later Great Britain and France declared war on Germany.Important dates in Europe and northern Africa: 1939-1942
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This World War II timeline covers events from June to September 1945. In order to force Japan to surrender, President Truman gave the command to drop two atomic bombs on Japanese cities. Follow the events that led to Japan's surrender and the end of World War II.