After allying with Japan in the Anti-Comintern Pact and then also with Benito Mussolini's Italy in the "Pact of Steel", and finally signing a non-aggression treaty with the Soviet Union in August 1939, Hitler launched the Second World War on 1 September 1939 by attacking Poland. To his surprise Britain and France declared war on Germany, but there was little fighting during the "Phoney War" period. War began in earnest in spring 1940 with the successful Blitzkrieg conquests of Denmark, Norway, the Low Countries, and France. Britain remained alone but refused to negotiate, and defeated Germany's air attacks in the Battle of Britain. Hitler's goal was to control Eastern Europe but because of his failure to defeat Britain and the Italian failures in North Africa and the Balkans, the great attack on the Soviet Union was delayed until June 1941. Despite initial successes, the German army was stopped close to Moscow in December 1941.