During the summer and fall of 1941, in reprisal for guerrilla attacks, the Germans carried out several massacres of Belgrade citizens; in particular, members of the Jewish community were subject to mass shootings at the order of General Franz Böhme, the German Military Governor of Serbia. Böhme rigorously enforced the rule that for every German killed, 100 Serbs or Jews would be shot. Belgrade became the first city in Europe to be declared by the Nazi occupation forces to be Judenfrei. The resistance movement in Belgrade was led by Major Žarko Todorović from 1941 until his arrest in 1943.