At dawn on 19 December, Peiper attacked the American defenders of Stoumont. He sent infantry from the 2nd SS Panzergrenadier Regiment in an attack and a company of Fallschirmjäger. He followed this with a Panzer attack, gaining the eastern edge of the town. An American tank battalion arrived but Peiper finally captured Stoumont at 1030. Knittel joined up with Peiper and reported the Americans had recaptured Stavelot to their east. Peiper ordered Knittel to retake Stavelot. He thought Kampfgruppe did not have enough fuel to cross the bridge west of Stoumont. On the same evening the U.S. 82nd Airborne Division under Maj. Gen. James Gavin arrived at La Gleize. Kampfgruppe Sandig, which had been ordered to take Stavelot, launched another attack without success. Sixth Panzer Army commander SS-Oberstgruppenführer Sepp Dietrich ordered Hermann Prieß, commanding officer of the I SS Panzer Corps, to help Peiper's Kampfgruppe, but Prieß was unable to break through.