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 . 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 . Many concentration camps were established across the area . Banjica concentration camp was the largest concentration camp , with primary victims being Serbian Jews , Roma , and Serb political prisoners
Kragujevac massacre
Kragujevac massacre
Serbia