He could have been in a unit that closed The Bulge in January.
The bloodiest fightings took place in that month as Mr. A wanted to (1) destroy the Bastogne corridor by sending remnants of SS Panzer units like the 1st SS Panzer towards the area and (2) hold as much terrain as possible to pin down the US units there so he could launch other offensives (Alsace).
Every area lost in December was recaptured with heavy fightings and heavy losses on both sides as well.
And the weather went from worse to severe in that month.
Non-organic units shifted from one place to the other were they were needed.
A lot of these units were used as infantry units as well during The Bulge.
It also could be that he was a replacement joining the unit in January?
Erwin