The Yugoslav Partisans were the main resistance movement engaged in the fight against the Axis forces in the Balkans during World War II.
They went under the official name of People’s Liberation Army and Partisan Detachments of Yugoslavia (Narodno-oslobodilačka vojska i partizanski odredi Jugoslavije), and were under the direct command of Marshall Tito and the Yugoslav Communist Party Politburo.
The occupying forces instituted such severe burdens on the local populace (e.g. the army of Nazi Germany would hang or shoot indiscriminately, including: children, womenfolk, and the old, up to 100 local inhabitants for every one Wehrmacht soldier killed) that the Partisans came not only to enjoy widespread support but for many they were the only option for survival.
The PLA & PDY (NOV i POJ) was established in 1942 from Yugoslav partisan bands, and eventually evolved into a regular force, the Yugoslav People’s Army, on March 1, 1945.
The Partisans and the People’s Liberation Army staged a guerrilla campaign widely supported by the sufering population. There were people’s committees organized to act as civilian governments in liberated areas of the country, and even limited arms industries were set-up.
During this stage great pressure was made by the occupying and quisling forces as seven major anti-partisan Offensives atest. The biggest being by combined Wehrmacht, the SS, Fascist Italy, Ustaše, Chetniks and Bulgarian forces, the so called Fall Weiss (Plan White) and Operation Schwarz (Operation Black), or as they were known in the Yugoslav annals: the 4th (Battle of Neretva) and 5th (Battle of Sutjeska) Offensives.
Later in the conflict the Partisans were able to win the moral, as well as limited material support of the Allies, who until then had supported General Dragoljub “Drazha” Mihailovich’s Royalist Chetnik Forces, but were finally convinced of who was doing the fighting against the Axis in the region by many military missions dispatched to both sides during the course of the war.
After the Teheran Conference in 1943 they received official recongnition as the legitimate national liberation force by the Allies, who sunsequently set-up the RAF Balkan Air Force under the influence and suggestion of Brigadier-General Fitzroy MacLean, and with the aim to provide increased supplies and tactical air support for Tito’s forces.
Towards the end of war, in 1945, the Red Army facilitated the liberation of the Capital, Belgrade. However, the country is considered to be the only one in WWII which was liberated by it’s own forces, with the assistance and active participation of the populus.