 That month, the British government, upon the request of the Yugoslav government-in-exile, insisted Tito make Mihailović the commander-in-chief of resistance forces in Yugoslavia, a demand he refused.Partisan-Chetnik truces were repeatedly violated by the Chetniks, first with the killing of a local Partisan commander in October and then later, under orders of Mihailović's staff, massacring 30 Partisan supporters, mostly girls and wounded individuals, in November.Despite this, Chetniks and Partisans in eastern Bosnia continued to cooperate for some time.