The twelfth day saw the battle firmly in its counter-offensive phase. The 6. Panzerarmee was ordered over to the defensive. The 2. SS-Panzer-Division was pushed out of Grandmenil and Manhay at dawn. German forces were being pushed back in multiple sectors, and the westward drive had been definitively halted.
Trucks and ambulances rolled into Bastogne on the road opened by CCR, 4th Armored Division, formally ending the siege. The 7th Armored Division recaptured Manhay early in the day. The 551st Parachute Infantry Battalion secured Noirefontaine in a night raid against the 62. Volksgrenadier-Division at the cost of 18 casualties. At Stavelot, the Germans completed their evacuation from the right bank of the Amblève.