From the beginning of the Serbian uprising in the summer of 1990 until the summer of 1991, the Yugoslav People's Army prevented the Croatian authorities from establishing the constitutional order of the Republic of Croatia over rebellious areas. When the rebellious Serbs declared the state of war in July 1991, the YugoslavPeople'sArmy openly joined the aggression against Croatia. The armed forces of the rebel Serbs consisted of Territorial Defense andpolice. They were supported and armed by the Yugoslav People's Army, which even commanded over them from September 1991 to May 1992. In the Lika region the Army established the 2nd operational zone, which was constituted of Territorial Defense units.The Zone was restructured by the Army in February 1992, before the arrival of United Nations Peacekeeping forces. The Territorial Defense Zone was created. Considering that in 1992 the Territorial Defense was renamed to the Army of the Republic of Serb Krajine, the Territorial Defense Zone was then renamed to the Lika Corps. The corps consisted of five brigades, one battalion, support units and a logistics base. From the end of 1992, until the defeat in the summer of 1995, the Lika corps had no major organizational changes but had major difficulties in functioning.