D-Day was the pivitul moment of World War II. Had it failed General Eisenhower would have been stripped of two stars and forced into retirement.
Would the Nazis have won if D-Day had failed?
While I'm very proud of Canada's action in Normandy, it did not cost Germany the war, in all honest the Russians woud likely of won the war by 1946-47. Had the invasion of Northern France failed it would of become a simple matter of beefing up Operation Anvil, what's operation Anvil you ask? Well, Anvil was the allied invasion of France from the South, they did quite well, throwing the supplies of D-Day behind it they probably could of captured France eventually. The would also of captured Austria and could of moved into the Low Countries, probably not though. But then again, by 1945 America had the bomb, and might of used it on Dresden, forcing a surrender that way.
Siege