(as many senior officers, including the 101st's commander—Major General Maxwell Taylor—were elsewhere). Due to the worst winter weather in memory, the surrounded U.S. forces could not be resupplied by air nor was tactical air support available due to cloudy weather. However, the two Panzer divisions of the XLVII Panzer Corps—after using their mobility to isolate Bastogne, continued their mission towards the Meuse on 22 December, rather than attacking Bastogne with a single large force. They left just one regiment behind to assist the 26th Volksgrenadier Division in capturing the crossroads. The XLVII Panzer Corps probed different points of the southern and western defensive perimeter in echelon, where Bastogne was defended by just a single airborne regiment and support units doubling as infantry. This played into the American advantage of interior lines; the defenders were able to shift artillery fire and move their limited ad hoc armored forces to meet each successive assault. It was on the 22nd of December that General von Lüttwitz submitted the following demand for surrender to his American counterpart commanding the American forces in Bastogne, Brigadier General Anthony McAuliffe: Shortly thereafter, McAuliffe sent the following communication to von Lüttwitz in response to the German demand: To the German Commander. NUTS! The American Commander The commander of the US 327th Glider Infantry Regiment interpreted it to the German truce party as "Go to hell!" Despite the defiant American response to the surrender demand, the 26th VG received one Panzergrenadier regiment from the 15th Panzergrenadier Division on Christmas Eve for its main assault the next day. That night, at about 7:00 PM, Luftwaffe bombers attacked Bastogne, killing 21 in an aid station. Because it lacked sufficient troops and those of the 26th VG Division were near exhaustion, the XLVII Panzer Corps concentrated its assault on several individual locations on the west side of the perimeter in sequence rather than launching one simultaneous attack on all sides. The assault—led by 18 tanks carrying a battalion of infantry—pierced the lines of the 327th's 3rd Battalion (officially, the 1st Battalion, 401st Glider Infantry), and advanced as far as the battalion command post at Hemroulle. However, the 327th held its original positions and repulsed infantry assaults that followed, capturing 92 Germans. The panzers that had achieved the penetration divided into two columns, one trying to reach Champs from the rear, and were destroyed in detail by two companies of the 1st Battalion