By October the inmates were evacuated to Gross-Rosen concentration camp, where inmates were suffering from severe overcrowding and a shortage of food. Wiesenthal's big toe on his right foot had to be amputated after a rock fell on it while he was working in the quarry. He was still ill in January when the advancing Soviets forced yet another evacuation, this time on foot, to Chemnitz. Using a broom handle for a walking stick, he was one of the few who survived the march. From Chemnitz the prisoners were taken in open freight cars to Buchenwald, and a few days later by truck to Mauthausen concentration camp, arriving in mid-February 1945. Over half the prisoners did not survive the journey. Wiesenthal was placed in a death block for the mortally ill, where he survived on 200 calories a day until the camp was liberated by the Americans on 5 May 1945. He weighed when he was liberated.