Answer
Josip Broz Tito's Partisans were the initial allies of the Chetniks in guerrilla warfare. However, their collaboration was short-lived due to differing political ideologies and a power struggle for control of Yugoslavia. Ultimately, the Chetniks shifted their allegiance and collaborated with the occupying Axis forces, leading to armed conflict with Tito's Partisans, who continued to fight for Yugoslav liberation.