Westwall
The US 70th Infantry Division was tasked with punching through the Siegfried Line and taking Saarbrücken. As the fortifications were unusually strong, it first had to take the Siegfried Line fortifications on the French heights near Spicheren overlooking Saarbrücken. This "Spichern-Stellung" had been constructed in 1940 after the French had fallen back on the Maginot Line during the Phoney War.