After Slovenia and Croatia declared independence, violence escalated as the Serbs expanded the territory they held with the help of the Yugoslav People's Army (JNA), eventually to include SAO of Eastern Slavonia, Baranja and Western Srijem and SAO Western Slavonia.
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On September 16, 1991 during the Croatian War of Independence, Drniš was attacked by forces of the 9th Corpus of Yugoslav People's Army and militia of SAO Krajina led by general Ratko Mladić.
SAO Bosnian Frontier made attempts to unite with the Autonomous Region of the Serbian Frontier in Croatia.