 Following this defeat and the defection of one of their sub @-@ units to Drljević , Đurišić was induced to negotiate directly with the leaders of the HOS forces about the further movement of the Chetniks towards the Ljubljana Gap . However , this appears to have been a trap , as he was attacked and captured by them on his way to the meeting . According to the historian Professor Jozo Tomasevich , exactly what occurred after his capture is not clear , but Baćović , Đurišić , Vasić , Ostojić were subsequently killed , along with some Serbian Orthodox priests and others . According to some sources , on 20 April , Đurišić , Baćović , Vasić and Ostojić were taken to the Stara Gradiška prison , near Jasenovac . The Ustaše gathered them in a field alongside 5 @,@ 000 other Chetnik prisoners and arranged for Drljević and his followers to select 150 Chetnik officers and non @-@ combatant intellectuals for execution . Đurišić , Baćović , Vasić and Ostojić were amongst those selected . They and the others were loaded onto boats by the Ustaše and taken across the Sava River , never to be seen again . It is reported that they were killed either in the Jasenovac concentration camp itself , or in a marsh in its vicinity . The website of the Jasenovac Memorial Site says Ostojić was killed at the camp by the Ustaše in 1945 . The location of Ostojić 's grave , if any , is unknown . Both the NDH forces and Drljević had reasons for ensnaring Đurišić . The NDH forces were motivated by the mass terror committed by Đurišić on the Muslim population in Sandžak and southeastern Bosnia while Drljević was opposed to Đurišić 's support of a union of Serbia and Montenegro which ran counter to Drljević 's separatism . 
