On 10 May 1940, the Germans started their second blitzkrieg that overran the Netherlands, Belgium, and Luxembourg, and threatened France. Neville Chamberlain, resigned immediately as Prime Minister, and Winston Churchill was appointed to head a coalition government. Shortly afterwards the Germans initiated their assault on France, quickly overrunning the northern part of the country and forcing the evacuation of British and French troops from Dunkirk between 27 May and 4 June.