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Stalin and Hitler become allies in 1939. Britain and France finally realized that they must act to stop further Nazi aggression. Britain tried to form an alliance with the Soviet Union. Stalin had long opposed Hitler, but he thought Britain and France lacked the will to fight. Rejecting Britain's offer, he instead signed a treaty with Germany in August 1939 (Nichtangriffspakt). In the Nazi-Soviet Pact, Hitler and Stalin agreed not to attack each other. Secretly, the two nations agreed to divide up Poland and other parts of Eastern Europe. At dawn on September 1, 1939, German armies marched into Poland. Two days later, Britain and France declared war on Germany.