- G erman ▁quasi - prote ctor ate ", ▁controlled ▁by ▁the ▁Cro at ian ▁national ist ▁U sta še ▁movement ▁under ▁An te ▁Pav eli ć . ▁One ▁of ▁the ▁N D H ' s ▁policies ▁was ▁to ▁eliminate ▁the ▁state ' s ▁eth nic ▁Ser b ▁population ▁with ▁mass ▁kill ings , ▁exp uls ions ▁and ▁forced ▁assim ilation . ▁The ▁first ▁Dr var ▁Ser bs ▁were ▁killed ▁on ▁ 1 8   J une ▁ 1 9 4 1 . ▁The ▁at roc ities ▁acceler ated ▁the ▁formation ▁of ▁two ▁large ▁resistance ▁movements ▁in ▁occupied ▁Y ug oslav ia . ▁Royal ists ▁and ▁Ser bian ▁national ists ▁led ▁by ▁V K J ▁Colonel ▁Dra ž a ▁Mih ail ović ▁founded ▁the ▁Rav na ▁G ora ▁Mov ement , ▁whose ▁members ▁were ▁known ▁as ▁Ch et nik s . ▁The ▁K P J , ▁led ▁by ▁Jos ip ▁Bro z ▁T ito , ▁decided ▁in ▁Bel grade ▁on ▁ 4   J uly ▁to ▁launch ▁a ▁nation wide ▁armed ▁u pr ising ▁and ▁the ▁members ▁of ▁the ▁K P J - led ▁forces ▁became ▁known ▁as ▁Part is ans . ▁ ▁Pro - Part isan ▁activity ▁Between ▁ 2 0 ▁and ▁ 2 6   J uly ▁ 1 9 4 1 ▁local ▁K P J ▁leaders ▁organ ised ▁three ▁Part isan ▁det ach ments , ▁armed ▁with ▁about ▁ 2 0 0 ▁rif les ▁and ▁seven ▁light ▁machine ▁guns , ▁in ▁the ▁immediate ▁vic inity ▁of ▁Dr var ; ▁one