 As Italian auxiliaries , Đurišić 's detachment was so dependent on the Italians for arms and transport that it had not left Montenegro until 18 January 1943 , two days before the first phase of Case White was to begin . On 3 January 1943 , Ostojić issued orders to " cleanse " the Čajniče district of Ustaše – Muslim organisations . According to the historian Radoje Pajović , Ostojić produced a detailed plan that avoided specifying what was to be done with the district 's Muslim population . Instead , these instructions were to be given orally to the responsible commanders . Delays in the movement of Chetnik forces into Bosnia to participate in Case White alongside the Italians enabled the Chetnik Supreme Command to expand the planned " cleansing " operation to include the Pljevlja district in the Sandžak and the Foča district of Bosnia . A combined Chetnik force of 6 @,@ 000 divided into four detachments and commanded by Vojislav Lukačević , Andrija Vesković , Zdravko Kasalović and Bajo Nikić was assembled . Mihailović ordered all four detachments to be placed under the overall command of Đurišić . 
