From the interwar kingdom to Nazi occupation: the story of Yugoslavia in World War II, the partisan resistance, and the liberation of the country.
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After World War I, the Kingdom of Serbs, Croats, and Slovenes (renamed the Kingdom of Yugoslavia in 1929) became one of the largest states in southeastern Europe. However, the young kingdom faced serious internal problems from the start. Differences among the peoples — Serbs, Croats, Slovenes, Bosnians — in language, religion, and political traditions created constant tension.
King Alexander I Karadjordjevic established a dictatorship in 1929, attempting to overcome national divisions. He renamed the country "Yugoslavia" (land of the South Slavs) and divided it into banovinas instead of historical provinces. However, in 1934, he was assassinated in Marseille by Croatian and Macedonian nationalists.
On April 6, 1941, Nazi Germany and its allies invaded Yugoslavia. The capital Belgrade was subjected to massive bombing — Operation Retribution (Unternehmen Strafgericht). Without a declaration of war, the German air force destroyed a significant part of the city. The Yugoslav army surrendered in just 11 days.
The country was occupied and dismembered. On the territory of Croatia and Bosnia, the puppet Independent State of Croatia (NDH) was created under the fascist Ustasha regime. This regime carried out mass killings of Serbs, Jews, and Roma, including in the notorious Jasenovac concentration camp.
Two main resistance movements emerged in occupied Yugoslavia. The Chetniks, commanded by Draža Mihailović — predominantly Serbian monarchists — initially fought the occupiers but later collaborated with the Germans and Italians against the partisans.
The Partisans, led by , represented a communist movement that united representatives of all Yugoslav peoples. The partisan army became one of the largest resistance movements in occupied Europe, reaching approximately 800,000 fighters by the end of the war.
Tito proved himself as an outstanding military leader and politician. His slogan "Brotherhood and Unity" called on all peoples of Yugoslavia to fight together against the occupiers, overcoming national hostility.
Among the prominent figures of this period was the writer , who lived in occupied Belgrade during the war and wrote his major novels, including "The Bridge on the Drina." In 1961, he became the only Yugoslav Nobel Prize laureate in Literature. His works reflect the complex history of coexistence among the peoples of the Balkans.
By the autumn of 1944, the partisans, supported by the Red Army, liberated Belgrade (October 20, 1944). The fighting for the city was fierce. By May 1945, the entire territory of Yugoslavia had been liberated from the occupiers.
World War II was a catastrophe for Yugoslavia. According to various estimates, the country lost between 1 and 1.7 million people — approximately 10% of the population. A significant portion of the victims died not in battles against the occupiers but as a result of inter-ethnic violence, particularly the genocide carried out by the Ustasha regime.
The memory of the war and its victims became one of the most important themes in Yugoslav society. At the same time, it also became a source of future conflicts, as different peoples interpreted the wartime events differently.
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