Cobra King was serving in Company C of the 37th Tank Battalion of the American 4th Armored Division, which was the spearhead of General Patton's Third Army racing toward Bastogne. The 37th was then under the command of Creighton Abrams, later commander of American forces in the Vietnam War and Chief of Staff of the United States Army; Cobra King's commander was Lieutenant Charles Boggess, heading a crew of Hubert S. Smith, Harold Hafner, Milton Dickerman, and James G. Murphy. On December 26, 1944, Cobra King led its company in intense fighting in the village of Assenois. After fighting through the town, it made contact with the American 326th Airborne Engineer Battalion, at 4:50pm. With this, the German encirclement finally was broken, although several days would pass before supply lines to the south were firmly established. Cobra King then fought on into Germany. Within a short time in the field, the chalk legend "First In Bastogne" was weathered off, and it later gained a new crew, and the identity and historic status of the tank was largely lost. Cobra King was part of Task Force Baum, Patton's controversial and failed attempt to liberate the prison camp Oflag XIII-B. All the tanks of the task force were destroyed; According to Army historian Patrick R. Jennings, Cobra King was hit by a round that penetrated its armor and started a fire inside on March 27, 1945. No crewmen were killed, but the tank was abandoned, and the Germans later burned it.
After the war, the shell-pitted and gutted Cobra King was recovered from the battlefield and displayed as a symbolic "gate guard" at Ferris Barracks in Erlangen, Germany and, later, Rose Barracks in Vilseck. As Army historians slowly investigated the backstories of old WWII tanks remaining in Europe, Army chaplain Keith Goode began to suspect that the anonymous tank rusting at Rose Barracks was Cobra King. In 2008, Army historians concluded that it indeed was. In July 2009, the United States Army Center of Military History shipped Cobra King from Germany to the Patton Museum at Fort Knox for restoration. Restoration work included the difficult task of finding parts from original sources, such as an original Ford V-8 engine and tracks identical to Cobra King's originals. The exterior was restored, but no attempt was made to render the tank driveable or restore the fire-ravaged interior. On August 3, 2017, Cobra King was installed at the new National Museum of the United States Army at Fort Belvoir, twenty miles south of Washington, D. C.
