After the Allies signed the Armistice with Italy on September 8, 1943, Bolzano became the headquarters of the Prealpine Operations Zone and came under the control of the Nazi army. When the internment camp in Fossoli became vulnerable to Allied attack, it was dismantled, and a transit camp for prisoners headed for Mauthausen, Flossenbürg, Dachau, Ravensbrück and Auschwitz was set up in Bolzano.