The Battle of France, also known as the Fall of France, was the German invasion of France and the Low Countries during the Second World War. On 3 September 1939 France had declared war on Germany, following the invasion of its ally Poland. In early September 1939, France launched the Saar Offensive, which stalled. By mid October, French troops had been withdrawn to their original start positions. In six weeks from 10 May 1940, German forces defeated Allied forces by mobile operations and conquered France, Belgium, Luxembourg and the Netherlands, bringing land operations on the Western Front to an end until the Normandy landings on 6 June 1944. Italy entered the war on 10 June 1940 and invaded France over the Alps.
