In 1939, Hitler demanded Danzig and Polish Corridor, the way up to the ocean with Poland. Poland rejected the demand. Britain and France supported Poland. On 24 August 1939, Hitler signed treaty named Nazi-Soviet Pact with Russia. They agreed not to fight against each other for ten years and divided Poland and take its part to their kingdom. On 1st September, 1939 Hitler began war named Blitzkrieg or lightning against Poland. France and Britain declared war against Germany. After this the Second World War began.