 In the wake of the invasion, the Chetniks were the first of the two resistance movements to be founded.The pre-war Chetnik leader Pećanac soon came to an arrangement with Nedić's collaborationist regime in the Territory of the Military Commander in Serbia.Colonel Draža Mihailović, who was "interested in resisting the occupying powers", set up his headquarters in Ravna Gora and named his group "The Ravna Gora Movement" in order to distinguish it from the Pećanac Chetniks and others calling themselves Chetniks who engaged in collaboration with the Germans.