In June 1941, Račić arrived on mountain Cer near Šabac where he designated the place for the headquarters of Yugoslav Army soldiers under his command. During the Summer of 1941, he organized several military units under his command, first the "Cer company" commanded by the Lieutenant Ratko Teodosijević who came from Ravna Gora together with Račić. Then he established the "Čokešina company", the "Mačva company" (commanded by Lieutenant Nikola Sokić), the "Machine gun company" commanded by Lieutenant Voja Tufegdžić. The newly established "Prnjavor company" was composed of Serb refugees who escaped from Croatian Ustaše genocide and was a unit within "Chetnik Cer Detachment". The Chetnik detachment was military unit of the operational Royal Yugoslav Army and the commanding officers were active and reserve Yugoslav officers determined to struggle against the enemy using guerilla Chetnik methods.