From How good was the Good War?:
The best description of how Hitler was defeated was Stalin’s. The old monster said that England provided the time, America provided the money, and Russia provided the blood.Not only did it take the Western Allies nearly three years after the German attack on Russia seriously to engage the German army in Normandy, but even then most of the fighting was still on the other side of Europe. In the campaign from D-Day to V-E Day, something like 110,000 American soldiers were killed, as well as about half as many from the combined British-Canadian armies. That sounds formidable, and indeed is by today’s standards, until you remember that in the same 11-month period more than half a million Russians were killed on the Eastern Front. Leaving aside the respective Allied casualties, to see how the war was won you need only compare two figures. In all the western campaigns of the war against French, British, Americans, and troops of many other lands, some 200,000 German soldiers died. Four million Germans died on the Eastern Front.