On June 6, 1944, during World War II, nearly 160,000 Allied troops landed in Normandy, France, on what is known as 'D-Day', and they launched 'Operation Overlord' to liberate German-occupied Western Europe.
Over 4,400 Allied troops were killed on that single day, and more than half of them were Americans. The exact number of German casualties on D-Day is not known, but it is estimated between 4,000 and 9,000 killed, wounded or missing.
