Britannica Sources used in this answer

How did Operation Dynamo evacuate Allied troops from Dunkirk?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Nazi leaders in Paris — Battle of France Adolf Hitler (center) in front of the Eiffel Tower in Paris shortly after signing an armistice with France, June 1940.

Operation Dynamo was the mission to evacuate Allied troops from the French seaport of Dunkirk during World War II, directed by Adm. Bertram Home Ramsay.1

Because the beach at Dunkirk was too shallow for large Royal Navy battleships to approach, Capt. William Tennant, serving as the beachmaster, improvised a solution to expedite the rescue. He utilized a 1,400-yard-long breakwater as an improvised dock, allowing troops to board rescue vessels more efficiently than directly from the beach.12

The operation involved approximately 1,000 vessels, including about 700 civilian craft—such as yachts, fishing boats, and pleasure steamers—that ferried soldiers to larger ships waiting in the North Sea. Throughout the nine-day evacuation, the Royal Air Force provided critical protection by intercepting German Luftwaffe bombers. Between May 26 and June 4, 1940, these combined efforts successfully rescued 338,226 British, French, and other Allied troops.132