On September 1, 1939, German troops invaded Poland. Britain and France declared war on Germany two days later. By the end of the month, Hitler's armies had overrun western Poland. Soviet armies occupied eastern Poland, and the two countries subsequently formally divided Poland between them. In April 1940, German forces conquered Denmark and Norway, and in May they struck at the Netherlands, Belgium, Luxembourg, and France. French and British troops offered ineffective resistance against the lightning-like strikes, or …showed first 75 words of 635 total…

…showed last 75 words of 635 total…in the winter of 1942-43; some 300,000 of Germany's finest troops were either killed or captured. By May 1943, Allied armies had driven the Axis forces out of Africa and had landed in Italy. Also of great importance, by 1943 the United States and British navies had succeeded in substantially reducing the German submarine threat to shipping. This cleared the way for the movement of arms and troops to Britain in preparation for a cross-channel invasion of France.