Siegfried Line, The The German Defense of the West Wall, September–December 1944 (Stackpole Military History Series)

Built as a series of forts, bunkers, and tank traps, the West Wall-known as the Siegfried Line to the Allies-stretched along Germany's western border. After D-Day in June 1944, as the Allies raced across France and threatened to pierce into the Reich, the Germans fell back on the West Wall. In desperate fighting-among the war's worst-the Germans held off the Allies for several months.