Why did Hitler order construction of the Atlantic Wall?

Adolf Hitler ordered the construction of the Atlantic Wall as a strategic measure to protect the vast territories under German control in western Europe against anticipated Anglo-U.S. offensives.

Intended to be an impregnable line of defense, the project was designed to stretch from northern Norway to the Pyrenees. The fortifications primarily consisted of pillboxes, gun emplacements, and massive blockhouses situated along the coastlines, supplemented by beach obstacles, mines, and barbed wire to deter amphibious landings and airborne incursions.12

While Hitler viewed these defenses as a critical component of his strategy to secure the western front, he remained heavily preoccupied with the Eastern Front. Consequently, he paid limited attention to the actual progress and adequacy of the construction, despite warnings from commanders like Gerd von Rundstedt regarding the defensive shortcomings. Ultimately, the wall proved less formidable than intended, as the Wehrmacht struggled with inefficient command structures and the diversion of resources to other theaters of war.12