Why were German defenses in France inadequate before D-Day?

German defenses in France were inadequate before D-Day due to a combination of strategic miscalculations, logistical constraints, and internal command failures within the Wehrmacht.

Key factors included:

• Strategic Misdirection: The Germans were deceived by Allied operations, such as Operation Fortitude, into believing the Normandy landings were a diversion and that a larger invasion would follow in the Pas-de-Calais. Consequently, they kept their most battleworthy troops stationed there rather than in Normandy.12
• Command Dissonance: A rigid chain of command deferred critical decisions to Adolf Hitler. Furthermore, commanders Gerd von Rundstedt and Erwin Rommel disagreed on defensive strategy: Rundstedt favored holding reserves inland for a massive counterattack, while Rommel advocated for immediate action on the beaches.32
• Allied Superiority: The Germans lacked adequate air and naval support. Allied airpower severely impeded the movement of German reserves, forcing them to take long, harassed detours.12
• Resource Depletion: Demands from other fighting fronts had siphoned away many of the best German troops, leaving the forces in France with a high proportion of static divisions.12