I believe you are thinking about the 106th Division, the Golden Lions.
http://en.wikipedia.org/wiki/106th_Infantry_Division_%28United_States%29
The 106th was one of the last combat units deployed to Europe, and in December 1944, it was thought they would get some on the job training in the “quiet” Ardennes sector. Two regiments, the 422 and 423 Infantry, were placed in the exposed Schnee Eifel salient, and were surrounded and destroyed in the first few days of the battle. The third regiment, the 424th, was defending St. Vith and suffered heavy casualties. The division was never fully reconstituted and not returned to major combat.
The other division destroyed in the Ardennes was the 28th, a veteran division sent there to recover from heavy losses in the Hurtgen Forest. It was stretched over a very long front. The northern regiment, the 112th, was herded into the St. Vith “Fortified Goose Egg.” The southern regiment, the 109th, was pushed back to the south. The center regiment, the 110th, bore the full brunt of 5th Panzer Army’s attack and was wiped out. 28th Infantry Division also did not fully recover from this mauling.