Buchenwald Concentration Camp Bones of anti-Nazi German women still are in the brick ovens in the crematorium. The ovens were manufactured by J. A. Topf & S?hne, the company which also made the ovens for the notorious death camps in what is now Poland. These ovens used coke for fuel and by the end of the war, the shortage of fuel resulted in a pile of bodies in the camp, waiting to be buried. The camp had been liberated by soldiers of the 6th Armored Division of the U.S. Third Army on April 11, 1945. Liberated prisoners had killed guards already before arrival of the Americans. Germany. Date: April 1945