In the summer of 1990, after the first multiparty elections in Croatia, majority of the Serbian population started an open rebellion against the democratically elected Croatian authorities. During the second half of 1990 and the first half of 1991, they were organized by, received assistance, weapons and equipment from the State Security Service of Serbia and then the Yugoslav People's Army, which has from the beginning, prevented Croatia from establishing the constitutional order of the occupied territories. In the summer of 1991, Yugoslav People's Army had started an open aggression against Croatia. This paper aims to present the emergence of, the structure, organization, characteristics and activities of the armed forces of the rebelled Serbs in the Northern Dalmatia, which along with the city of Knin, was the political and military center of the rebellion, and until 1995 the center of the Serbian parastate in Croatia. The armed forces of the rebelled Serbs consisted of the police and the Territorial Defense, which were commanded by the Yugoslav People's Army from September 1991 to May 1992. The forces of the Territorial Defense in northern Dalmatia have been organized by the Yugoslav People's Army as the 1st operational zone, which has been restructured at the end of February 1992 as the Regional Headquarters of the Territorial Defense of Northern Dalmatia. At the end of 1992, the rebelled Serbs joined together the Territorial Defence and the Special Police Forces and formed the Army of the Republic of Serb Krajina, and the Regional Headquarters was renamed as its 7th (North Dalmatian) corps. The corps consisted of six brigades, three regiments, two battalions and a logistics base. It was well-armed and equipped, and of all the corpses of the Army of the Republic of Serb Krajina it was by its organizational and structural features the one most similar to the Yugoslav People's Army corps. Nonetheless, based on the information gathered from the analyzed sources, it can be concluded that, until their downfall in August 1995, the armed forces of the rebelled Serbs in Northern Dalmatia faced significant difficulties in their functioning.