Political map of Europe & the Mediterranean 21 June 1940 (Fall of France): As the British evacuated what troops they could from Dunkirk (Dunkirk evacuation), the Germans regrouped for a second great offensive (Battle of France) deep into the heart of France. Mussolini (Benito Mussolini) declared war on the Allies (Allies of World War II) on June 10, Paris fell on the 14th. A week later a defeated France agreed to an armistice (Second Armistice at Compiegne).