The Dunkirk evacuation, code-named Operation Dynamo, also known as the Miracle of Dunkirk, was the evacuation of Allied soldiers from the beaches and harbour of Dunkirk, France, between 27 May and 4 June 1940, during World War II. The operation was decided upon when large numbers of Belgian, British, and French troops were cut off and surrounded by the German army, during the Battle of France.