No. Yugoslavia as a country did not exist during the war. It was created because of the war, in the post-war Treaty of Versailles process. Much of Yugoslavia had been part of the Austro-Hungarian (Hapsburg) Empire, and perhaps some of it had been part of the Ottoman (Turkish) Empire, both of which were on the losing side in the war. Serbia had been an independent nation for about fifty years before WWI, and was a part of the new Yugoslavia. It was a Serb, in a terrorist group backed by the Serbian intelligence service, who murdered the heir to the throne of Austria-Hungary, striking the spark which started WWI.
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Josip Broz Tito - Marshal of Yugoslavia from 1943 until his death in 1980. He defied Russia during the Cold War and kept the Yugoslavian states together as one country.
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Bosnia-Herzegovina.
italy
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Yugoslavia :)
The country of Italy has participated in various wars. They were involved in World War I and World War II.
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Tito
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After World War I, the map of Europe drastically changed. Both the Ottoman Empire as well as Austria-Hungary no longer existed. However, a new country appeared after the war as well, Yugoslavia, known as the Kingdom of Serbs, became an independent country after World War I.
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Serbia Yugoslavia