The Yugoslav territory was the scene of a civil war between royalist Chetniks commanded by Draža Mihailović and communist partisans commanded by Josip Broz Tito. Axis auxiliary units of the Serbian Volunteer Corps and the Serbian State Guard fought against both of these forces. Siege of Kraljevo was a major battle of the Uprising in Serbia, led by Chetnik forces against the Nazis. Several days after the battle began the German forces committed a massacre of approximately 2,000 civilians in an event known as the Kraljevo massacre, in a reprisal for the attack. Draginac and Loznica massacre of 2,950 villagers in Western Serbia in 1941 was the first large execution of civilians in occupied Serbia by Germans, with Kragujevac massacre and Novi Sad Raid of Jews and Serbs by Hungarian fascists being the most notorious, with over 3,000 victims in each case. After one year of occupation, around 16,000 Serbian Jews were murdered in the area, or around 90% of its pre-war Jewish population during The Holocaust in Serbia. Many concentration camps were established across the area. Banjica concentration camp was the largest concentration camp and jointly run by the German army and Nedić's regime, with primary victims being Serbian Jews, Roma, and Serb political prisoners.