 The Chetniks were active in uprising against the German occupiers throughout 1941.Following the success of the Battle of Loznica, Mihailović's Chetniks were the first to liberate a European city from Axis control.Following this, German occupiers enacted Adolf Hitler's formula for suppressing anti-Nazi resistance in Eastern Europe, a ratio of 100 hostages executed for every German soldier killed and 50 hostages executed for every soldier wounded.