In the early morning hours of September 1, 1939, the German armies marched into Poland. On September 3 the British and French surprised Hitler by declaring war on Germany, but they had no plans for rendering active assistance to the Poles.
The Battle of Britain
In the summer of 1940, Hitler dominated Europe from the North Cape to the Pyrenees. His one remaining active enemy--Britain, under a new prime minister, Winston Churchill--vowed to continue fighting. Whether it could was questionable. The British army had left most of its weapons on the beaches at Dunkirk. Stalin was in no mood to challenge Hitler. The U.S., shocked by the fall of France, began the first peacetime conscription in its history and greatly increased its military budget, but public opinion, although sympathetic to Britain, was against getting into the war.
The Germans hoped to subdue the British by starving them out. In June 1940 they undertook the Battle of the Atlantic, using submarine warfare to cut the British overseas lifelines. The Germans now had submarine bases in Norway and France. At the outset the Germans had only 28 submarines, but more were being built--enough to keep Britain in danger until the spring of 1943 and to carry on the battle for months thereafter.
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