The first portion of the 827th to be deployed for combat was a single company in support of the 714th Tank Battalion of the
12th Armored Division, on 20 December 1944. Failing to see action, the company was withdrawn to reserve after three days on the line. Discipline proved to be a problem during this period, with men abandoning their guns to collect firewood, despite assistance and advice from the
614th Tank Destroyer Battalion (an experienced and well-regarded black unit operating in the same area). A second company was used for screening purposes in the first week of January, also not seeing combat, while the remainder of the battalion narrowly avoided being assigned to an indirect-fire role it was completely unprepared for. On 6 January, the battalion while still attached to the 12th Armored Division, was assigned to participate in Task Force Wahl led by the
79th Infantry Division, which was defending against the January, 1945,
German counteroffensive in the Alsace-Lorraine region. Disciplinary problems persisted; the company ordered to lead the move was unable to deploy as most of its men were absent, and the remainder mostly drunk. By the time the battalion managed to move, one of its officers had shot a man—and been shot himself—while trying to restore order among his company, and in a separate incident a sergeant had been assaulted by one of his own men and, defending himself, accidentally shot a bystander. The following two weeks saw a period of prolonged combat, as the task force slowly fell back to the pressure of the German offensive, with the battalion split up among various commands and often cut off or out of communication. The infantry units the tank destroyers were assigned to expected to take full operational control, often giving inappropriate orders more suited to tanks than to the lightly armored M18s, breeding resentment among the battalion's crews. At the same time, the 827th had trained with the expectation that the gunners would fire only on the direct instruction of their own officers, which limited both their ability to co-operate with outsiders and their willingness to adapt and improvise during small-scale combat. Vehicle commanders regularly argued about orders, or refused to act on them without their "own" commander present. In one case on 9 January, an infantry commander threatened to shoot a M18 crew if it did not engage a German tank stranded on the roadside. Not all elements of the battalion suffered similar problems, however; on the same day, 9 January, B Company destroyed eleven German tanks advancing on the village of
Rittershoffen, with four more the next day, while another section working with the
813th Tank Destroyer Battalion in
Hatten nearby accounted for nine. These units remained with the infantry in the village for several days, unable to withdraw, and acquitted themselves well in close fighting. This was all the more of an achievement when it was considered that, leaving disciplinary problems aside, the battalion suffered from major training deficiencies and was entirely combat inexperienced. One member of the battalion was awarded the
Silver Star, while the 79th Division recommended a crew which had fought in
Hatten to receive
Bronze Stars—it is unclear if these were ever awarded. ==Service duties==