"There were only 2 units with Tiger Is in the area of the Ardennes but only one of them saw action in the battles.
On 18 December 1944 schwere Panzerkompanie "Hummel" was assigned to schwere Panzer-
Abteilung 506 as it's 4.Kompanie. At this point it had 8 Tiger Is while the balance of 506 had 47 Tiger IIs. These Tiger Is did fight in the battles in the Ardennes and on 17 January 1945 1 of the Tiger Is that had been damaged in battle was destroyed by the crew since it could not be recovered prior to the withdrawal. "Hummel" stayed with 506 until 16 February 1945 when they left with 5 Tiger Is to operate as an independent unit the remainder of the war.
schwere Panzer-
Abteilung (Tiger/Fkl) 301 with 29 Tiger Is received word on 15 December 1944 that they were to be attached to the 9. Panzer-Division. They assembled in Niederaussem to entrain for transport which was scheduled to begin on 20 December 1944. On 22 December 1944 members of the unit Stab went into the Eifel to establish contact with the HQ of the 9. PD, which was scheduled to relieve the 2. PD fighting near Celles. However, before the rail transport of the Tigers could happen, all of the rail lines had been destroyed so on 25 December 1944 301 was released from it's attachment to the 9.PD. The Tigers were unloaded and 301 moved to Nörvenich where it became an Army Group reserve of the LXXXI. Armee-Korps. During the first half of 1945 301 carried out repairs and maintenance to their equipment as well as personnel reorganization. Hence they never took action in the Ardennes actions. In fact they did not enter action untill 20 January 1945 at Waldfeucht aganist the British in the Rhineland operations. At this point they had 27 Tiger Is. It appears the reduction of 2 was the result of 2 Tiger Is being sent to Maintenance in early January 1945. When they went in combat in the second half of January 1945 they had 52 BIVs on their roster. However it appears that the demo tanks were never used again although there were orders for them to be used to destroy bridges over the Ruhr River on 10 April 1945. This order was recinded so the demo tanks were sent back to the supply unit"