The Allies gained a stroke of luck, either planned or unplanned, from the Germans. General Halder, Chief of Staff, later claimed the orders were direct from Hitler, who wanted let the British escape and engender the possibility of English public support for a negotiated peace. Field commanders’ diaries and other sources indicate that the panzers, far ahead of the infantry, were stopped to wait for them and to straighten the German lines. In any case, the Germans paused for four critical days.
Under relentless air attack, which seemed to counter Halder’s claims of saving the army and the goodwill of the British people, the British began to evacuate on May 29. At first a trickle, then a torrent, began to come off the beach.
RAF Fighter Command was fighting a huge air battle, plunging badly needed resources into the battle over Dunkerque. Nevertheless, three destroyers were sunk on May 29, along with twenty-one smaller vessels. The plan had called for 48,000 men to be removed; by the evening of May 30, 120,000 were rescued. Among these only 6,000 were French; this worried Churchill greatly. He asked for more French soldiers to be evacuated and also for Lord Gort to leave. He did so the next day.
The Luftwaffe made their strongest attacks on June 1, and the Royal Navy lost 31 ships and smaller craft. 132,000 troops were brought out, and the perimeter shrank more and more as the men within left. After that withdrawals were made at night. On June 4, the last day of Operation Dynamo, over 26,000 French troops were returned to England.
Most of the French went back to fight in France, but the rescue of the BEF gave heart to the British public all out of proportion to the defeat it suffered. Churchill, addressing the House of Commons on June 4, said, “wars are not won by evacuations.”