Sixty-seven years ago, free men of America, Great Britain, Canada, and Poland-in-exile stormed the shores of Normandy into the teeth of Adolf Hitler’s Fortress Europe. The losses at Omaha Beach especially were astounding; over 4400 Allied servicemen died in the assault, and 7500 more were wounded or went missing. Americans made up almost two-thirds of the overall casualties (over 6600). The German casualty figures were never known, but estimates range from 4000 to 9000. But that was just the first day of the Battle of Normandy. By the time Normandy was secured, over 425,000 casualties had been inflicted on both...