The 101st Airborne formed an all-round perimeter using the 502nd PIR on the northwest shoulder to block the 26th Volksgrenadier, the 506th PIR to block entry from Noville, the 501st PIR defending the eastern approach, and the 327th GIR scattered from Marvie in the southeast to Champs in the west along the southern perimeter, augmented by engineer and artillery units plugging gaps in the line. The division service area to the west of Bastogne had been raided the first night, causing the loss of almost its entire medical company, and numerous service troops were used as infantry to reinforce the thin lines. CCB of the 10th Armored Division, severely weakened by losses to its Team Desobry (Maj. William R. Desobry), Team Cherry (Lt. Col. Henry T. Cherry), and Team O'Hara (Lt. Col. James O'Hara) in delaying the Germans, formed a mobile "fire brigade" of 40 light and medium tanks (including survivors of CCR 9th Armored Division and eight replacement tanks found unassigned in Bastogne).