According to Josip Broz Tito himself, Serbs made up the vast majority of Anti-fascist fighters and Yugoslav Partisans for the whole course of World War II. The Republic of Užice was a short-lived liberated territory established by the Partisans and the first liberated territory in World War II Europe, organised as a military mini-state that existed in the autumn of 1941 in the west of occupied Serbia. By late 1944, the Belgrade Offensive swung in favour of the partisans in the civil war; the partisans subsequently gained control of Yugoslavia. Following the Belgrade Offensive, the Syrmian Front was the last major military action of World War II in Serbia. A study by Vladimir Žerjavić estimates total war related deaths in Yugoslavia at 1,027,000, including 273,000 in Serbia. The Ustaše regime committed the Genocide of Serbs and systematically murdered approximately 300,000 to 500,000 Serbs.