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World War II, Nazi Invasion of France, Dunkirk, 6th June 1940, British soldiers march through a debris littered street of Dunkirk during the bombardment as the British Expeditionary Force (BEF) was evacuated. (Photo by Popperfoto via Getty Images/Getty Images)

World War II, Nazi Invasion of France, Dunkirk, 6th June 1940, British soldiers march through a debris littered street of Dunkirk during the bombardment as the British Expeditionary Force (BEF) was evacuated. (Photo by Popperfoto via Getty Images/Getty Images)