Excerpts from Books and Wikipedia
Republic of Bosnia and Herzegovina vs. Bosnian Serb and Bosnian Croat entities within Bosnia and Herzegovina (supplied by Serbia and Croatia). "The war was part of the breakup of Yugoslavia. Following the Slovenian and Croatian secessions from the Socialist Federal Republic of Yugoslavia in 1991, the multi-ethnic Socialist Republic of Bosnia and Herzegovina – which was inhabited by mainly Muslim Bosniaks (44 percent), as well as Orthodox Serbs (32.5 percent) and Catholic Croats (17 percent) – passed a referendum for independence on 29 February 1992. This was rejected by the political representatives of the Bosnian Serbs, who had boycotted the referendum. Following Bosnia and Herzegovina's declaration of independence (which gained international recognition), the Bosnian Serbs, led by Radovan Karadžić and supported by the Serbian government of Slobodan Milošević and the Yugoslav People's Army (JNA), mobilised their forces inside Bosnia and Herzegovina in order to secure ethnic Serb territory, then war soon spread across the country, accompanied by ethnic cleansing." [Wikipedia],