Italian invasion of Yugoslavia
Part of World War II
Date May 1939 - October 1939
Location Southern Europe
Status Ended
Flag of Italy (1861-1946) Italy

Flag of Bulgaria Bulgaria (May 1939 – June 1939)

Pan-Slavic flag Yugoslavia

Flag of Poland Poland
Flag of the Kalmar Union Scandinavia
Military Support:
Flag of Hungary (1920–1946) Hungary
Flag of the Soviet Union (1923-1955) Soviet Union

Commanders and leaders
Flag of Italy (1861-1946) Benito Mussolini

Flag of Bulgaria Boris III

Pan-Slavic flag Peter II

Flag of Poland Władysław Anders
Flag of Poland Kacper Klups
Flag of Poland Felix Zyczynski
Flag of Poland Paskell Maneliz
Flag of Poland Zygmunt Berling
Flag of the Kalmar Union Olof Thörnell

The Italian invasion of Yugoslavia is an ongoing conflict between Peter II's Yugoslavia and Mussolini's Italy. The conflict finds its origins in the Yugoslav declaration of war upon Italy following legal issues about contested Albania. Fighting began relatively recent, more will be added when necessary.


With Albania as contested ground, both Italy and Yugoslavia had claims on its territory. Italy had however annexed Albania some time before the war. Following severed relations and topping tensions, in the first last week of May, Yugoslavia declared war on Italy, subsequently joined by Poland.

The war

While considered a front of World War II, the invasion itself was a prelude. Shortly after the declaration of war, the Slovenian front was opened by Italian forces. Yugoslav forces soon met the Italian forces and a firefight broke out.

During the first week of June, Poland joined on the Yugoslavian side, sending three-thousand soldiers to the aid of Yugoslavia. Italy secretly started to support nationalism of Yugoslavia's member states.

Two weeks later, Hungarian 104M Krévs with Polish roundels were sent by Hungary to support the Slavic forces at the Slovenian front.

In the first week of July, Italy dispatched another million forces to the Slovenian front, with their apparently newly acquired German tanks.

In the second week of July, Sweden joined the war on the side of Yugoslavia and sent 750,000 soldiers to fight at Trieste at the Italian-Yugoslavian border.

Sweden declared war upon Italy later on, attacking several regions and occupying them afterwards.

Hungary also later declared war.

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