The Chetniks were a partner in the pattern of terror and counter terror that developed in Yugoslavia during World War II. The Chetniks used terror tactics against the Croats in areas where Serbs and Croats were intermixed, against the Muslim population in Bosnia, Herzegovina and Sandžak, and against the Yugoslav Partisans and their supporters in all areas. These terror tactics took various forms, including killing of the civilian population, burning of villages, assassinations and destruction of property. The terror tactics used by the Chetniks against the Croats was largely a reaction against the mass terror perpetrated by the Ustaše, and the terror against the Partisans and their supporters was ideologically driven. The Muslim population of Bosnia, Herzegovina and Sandžak was a primary target of Chetnik terror due to the traditional animosity between Serbs and Muslims, but this action was also undertaken to 'cleanse' these areas of Muslims in order to create a 'Greater Serbia'