Christmas Day 1944–the tenth day of Unternehmen Wacht am Rhein–marked the high-water mark of the German offensive. The 2. Panzer-Division was stopped at Celles, just four kilometres short of the Meuse River, representing the furthest German penetration. The offensive had reached its culminating point, with fuel shortages, disrupted communications, and Allied air dominance crippling operations across the front.
CCB of the 2nd Armored Division seized Celles, blocking the road to Dinant. The 82nd Airborne Division completed its withdrawal to a new defensive line from Trois-Ponts to Manhay. The major German attack on Bastogne was repulsed, and III Corps continued driving north. The initiative passed decisively to the Allies.