The 1992 Yugoslav campaign in Bosnia was a series of engagements between the Yugoslav People's Army (JNA) and the Territorial Defence Force of the Republic of Bosnia and Herzegovina (TO BiH) and then the Army of the Republic of Bosnia and Herzegovina (ARBiH) during the Bosnian War. The campaign effectively started on 3 April and ended 19 May.
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%), Orthodox Serbs (32.5%) and Catholic Croats (17%) – passed a referendum for independence on 29 February 1992.