By the numbers:
160,000 Allied troops, supported by more than 5,000 ships and 13,000 aircraft, landed along a 50-mile stretch of French coastline. While the Allies sustained major casualties–9,000 killed or wounded–more than 100,000 troops would go on to march across the Continent to defeat Hitler.
Their finest hour, as Churchill said on June 18, 1940.
But if we fail, then the whole world, including the United States, including all that we have known and cared for, will sink into the abyss of a new Dark Age made more sinister, and perhaps more protracted, by the lights of perverted science. Let us therefore brace ourselves to our duties, and so bear ourselves that, if the British Empire and its Commonwealth last for a thousand years, men will still say, “This was their finest hour.”