Germany and Italy occupied Yugoslavia in April 1941, but it was not until Germany invaded the Soviet Union in June of that year that the Yugoslav communists were ordered to mount attacks against Axis units. Partisan detachments conducted small-scale sabotage until September 1941, when they occupied the Serbian town of Užice and proclaimed a liberated Užice Republic.
After the Partisans were forced to retreat into the mountains of Montenegro and Bosnia and Herzegovina, they attracted enough recruits to designate themselves the People’s Liberation Army (PLA), with elite Proletarian Brigades selected for their fighting abilities, ideological commitment, and all-Yugoslav character. While the ethnic composition of partisan units varied widely over time and between regions, Tito's followers on the whole were Serbs. In November 1942 Tito demonstrated the strength of his movement by convening the Anti-Fascist Council for the National Liberation of Yugoslavia, which eventually became a provisional government. During 1943, the Partisans gained significant ground by spearheading the fight against Axis occupation, while simultaneously paving the way for Socialist Revolution by crushing the Chetniks. In May, the Partisans evaded a large-scale Axis offensive against them. Fearful that a powerful resistance force might encourage the Allies to invade the Balkan Peninsula, the Germans and Italians led seven major offensives against the PLA. The turning point of the war came in May 1943, when Partisans escaped encirclement in Herzegovina by forcing an exit up the Sutjeska Gorge. The battle of Sutjeska was of first importance in persuading the Allies to switch their support from the royalists to the communists. Anglo-American and Soviet arms and equipment thenceforth were supplied in ever-increasing amounts. The Italian surrender in the fall of 1943 relieved the military pressure on the Partisans, who also benefited from the capture of considerable supplies of munitions and equipment. By the end of 1943 the PLA had grown to an estimated 300,000 troops and had diverted a significant number of enemy forces from other Allied fronts. In October 1944 Partisans took part in the liberation of Belgrade by the Soviet Red Army; they were then able to focus their campaigns against the Chetniks and other Yugoslav collaborators.




















