The attack on Zvornik started on 8 April 1992 , just a few days after the Serb seizure of Bijeljina . According to witness accounts , former JNA troops from the following garrisons were involved during the attack : Planes and helicopters which participated were reportedly from Tuzla . Prior to the attack , units from Novi Sad , Šabac , Sremska Mitrovica and Valjevo ( Serbia ) were partly stationed along the Serbian side of the Drina river bank , and partly on the Bosnian side . They further participated in the attack on Zvornik , operating from Serbian territory . They were equipped with machine-guns ( M 52 , M 65 , M 66 , M 70A , M 70B , M 72 ) ; hand grenade launchers ( Zolja ) ; kalashnikovs ; MiG 21 and MiG 29 ( Jastreb ) with machine-guns and gunners ; helicopters ( MT 6 or MT 8 and others ) ; and knives . Infantry units were not only composed of the « regular members » of the former JNA and of mobilized reserve forces , but also of « volunteers » The military attack on Zvornik occurred on 8 April 1992 . Later , there were sporadic military operations with units of the former JNA cooperating with paramilitary units . These operations mainly focused on the medieval fortress of Kulagrad , southwest of Zvornik , where some dozen resistance fighters were holding out . However , on 26 April , this fortress was conquered in a concerted attack by former JNA troops , with air support , and by paramilitary units . Immediately after the fall of Kulagrad , the town of Divić , situated south of Zvornik , was attacked . Divić was almost exclusively populated by Bosniaks and was situated at the hydro-electric power plant . The attack on the town was conducted both from the Serbian side and from Bosnian territory , using tank forces , artillery , and infantry units with portable mortars . JNA units and paramilitary units cooperated . Arkanovci operated in front-line positions , taking the city . Their core troops left the city after the successful attack to prepare a raid on the next city , Bratunac
Serb seizure of Bijeljina
Bijeljina massacre
Zvornik massacre