Ardennes
Germany's surprise offensive into the Ardennes on 16 December 1944, resulted in the U.S. Third Army being moved northward to attack the southern flank of the German army in Belgium and Luxembourg. Turning over its part of the front to the U.S. XV Corps, XII Corps moved to the area of Luxembourg city on 21 December 1944. Subsequently, the corps cleared the west bank of the Moselle River in Luxembourg until 11 January 1945. During 18–23 January, XII Corps assaulted across the Sauer River and cleared the twin confluences of the Our River and the Sauer, and then that of the Sauer and Moselle Rivers.
Read more about this topic: XII Corps (United States)