If Operation Overlord had failed

What would the Allies have done if Operation Overlord had failed?

They would probably have had to put more weight on the Italian route, but a failed Normandy landing would have created an enormous strategic and human crisis.

The Allies would likely have had to rely more heavily on the Italian route. A failed landing would have caused enormous casualties and left the coalition with major political and operational problems. The answer does not offer a detailed replacement plan, which reflects how difficult such a loss would have been to absorb. Overlord's scale made it far more consequential than one lost battle.