The 101st Airborne was originally supposed to go to Werbomont on the northern shoulder but was rerouted to Bastogne, located 107 miles (172 km) away on a 1,463 feet (446 m) high plateau, while the 82nd Airborne, because it was able to leave sooner, went to Werbomont to block the critical advance of the Kampfgruppe Peiper ("Combat Group Peiper"). The 705th Tank Destroyer Battalion—in reserve 60 miles (97 km) to the north—was ordered to Bastogne to provide anti-tank support to the armor-less 101st Airborne on 18 December and arrived late the next evening. The first elements of the 501st PIR entered the division assembly area 4 miles (6.4 km) west of Bastogne shortly after midnight of 19 December, and by 09:00 the entire division had arrived.