The Majority of the Serbs in WW2 fought with Marshal Tito and his Communist Partisans and the other Serbs fought with Draza Mihajlovic. Many websites say that the Chetniks and Draza Mihajlovic at some times collaborated with the German Nazis and the other Axis powers to defeat Tito and his Partisans but at other times, saved 500 American Fighter Pilots. I'm confused please respond to my question.