Buchenwald concentration camp The building at the entrance after liberation of the camp, which was liberated by soldiers of the 6th Armored Division of the U.S. Third Army on April 11, 1945. The camp was described as 'the worst concentration camp yet to be uncovered by west wall troops.' (6th Armored Division newspaper 'Armored Attacker'?. Liberated prisoners had killed guards already before arrival of the Americans. Germany. Photo: Signal Corps Film Still. Germany. - Date: April 1945