The Atlantic Wall, 1941 - 1944 ; Hitler's defenses for D-Day

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The success of the Allied invasion of Normandy was never inevitable ... to the contrary, Operation Overlord was fraught with risk and the potential of its failure loomed large. Both Eisenhower and Churchill understood the risks. Eisenhower had even prepared for this eventuality by writing a note (found crumpled in one of his shirt pockets long after D-Day by his naval aide) accepting full responsibility for Overlord's failure had the allies been compelled to withdraw from Normandy