How many American's died on D-Day? How many casualties did we have?How about the Brits and Canadians? Here is the breakdown of the casualties: British - 2700 Canadians - 946 Americans - 6603 Here is the breakdown on the killed: Britain: 2,700 killed United States: 1,465 killed Canada: 500 killed There were approximately 4,000 Germans killed and 9,000 Axis casualties. There were between 15,000-20,000 French civilians that died.