 They used terror tactics against Croats in areas where Serbs and Croats were intermixed, against the Muslim population in Bosnia, Herzegovina and Sandžak, and against the Communist-led Yugoslav Partisans and their supporters in all areas.These tactics included the killing of civilians, burning of villages, assassinations and destruction of property and exacerbating existing ethnic tensions between Croats and Serbs.The terror tactics against the Croats were, to at least an extent, a reaction to the terror carried out by the Ustaše, but Croats and Bosniaks living in areas intended to be part of Greater Serbia were to be cleansed of non-Serbs regardless, in accordance with Mihailović's directive of 20 December 1941.