In order to reach it before the Allies could regroup and bring their superior air power to bear, German mechanized forces had to seize the roadways through eastern Belgium. Because all seven main roads in the densely wooded Ardennes highlands converged on Bastogne (Bastnach in German), just a few miles away from the border with neighboring Luxembourg, control of its crossroads was vital to the German attack. The siege was from 20 to 27 December, until the besieged American forces were relieved by elements of General George Patton's Third Army.