As the period of the 'Phoney War' came to an end, the Nazis unleashed their Blitzkrieg tactics, which saw the rapid mobility of the ground forces closely supported by superior air power. The Netherlands, Belgium, Denmark and Norway fell in the spring, and the British Expeditionary Force made a hasty retreat from the beaches of Dunkirk in Operation Dynamo. Winston Churchill, the new Prime Minister of the coalition government, described the evacuation of thousands of troops by an armada of little vessels as a miracle. But, following the fall of France in June, he issued a sombre warning that Britain now fought alone. The nation's fate was in the hands of the 'Few', the men of fighter command who fought to hold back Goring's Luftwaffe in its bid to gain superiority in the air as the prelude to a German invasion. This was the Battle of Britain, and as the Spitfires and Hurricanes jousted with enemy fighters and bombers in the late summer of 1940, the ordinary people of London and many other cities and towns came to know the terror of the air raids.