suffer a humiliating defeat, the area's civilian population bore the brunt of the offensive. Between 10 June and 30 July 1942, 60,000 civilians living in the vicinity of Mount Kozara, mostly Serbs, were rounded up and taken to concentration camps. "Kozara was cleared to the last man," Wehrmacht Plenipotentiary General Edmund Glaise-Horstenau wrote, "and likewise, the last woman and last child." Following Kozara's depopulation, Luburić envisaged creating an annual "tax", whereby Serb boys would be taken from their families, conditioned to renounce their Serb national identity, and inducted into the Ustaše fold. In late 1942, he "adopted" 450 boys who had been displaced during the fighting around Mount Kozara. Dressed in black Ustaše robes, Luburić dubbed the boys his "little janissaries", an allusion to the Ottoman Empire's devşirme system, which saw tens of thousands of boys taken from Christian families across the Balkans and inducted into the Ottoman military. Each morning, Luburić's "janissaries" were forced to take part in military drills and say the Lord's Prayer. The experiment failed and the majority of the boys refused to become Ustaše. Most subsequently died of malnutrition, dysentery and other diseases. Hundreds of other children abducted by the Ustaše in the aftermath of the Kozara Offensive were saved by a group of Red Cross volunteers from Zagreb, led by Diana Budisavljević. In her diary, Budisavljević recalled an encounter she had with Luburić at Stara Gradiška, in which the latter chastised her and her colleagues for "caring only about Serb children", while there were Croat and Bosnian Muslim children across the NDH who were suffering as well. According to Budisavljević, Luburić threatened to have her and her colleagues detained, ominously warning that, "no one would know what had happened to them or their whereabouts." House arrest and disruption of the Lorković–Vokić plot In August 1942, Luburić was promoted to the rank of Bojnik (Major). Glaise-Horstenau complained to Pavelić that Luburić was interfering with German operations. The Germans distrusted Luburić, with one of their internal memorandums describing him as "a neurotic, pathological personality". Seeking to appease the Germans, Pavelić reassigned Luburić to Travnik. He appointed him commander of the Croatian Home Guard's 9th Infantry Regiment (), whose purpose would be to secure the NDH's border with Italian-occupied Montenegro in East Herzegovina, which had a heavy Chetnik presence. As the 9th Infantry Regiment was preparing to leave for Herzegovina, Luburić shot and killed one of the