The HV Zagreb Corps, assigned the Storm-1 plan, initially commanded by Major General Ivan Basarac, on the left flank of the Karlovac Corps, was deployed on three main axes of attack—towards Glina, Petrinja and Hrvatska Kostajnica. It was opposed by the ARSK 39th Banija Corps, headquartered in Glina and commanded by Major General Slobodan Tarbuk. The Zagreb Corps was tasked with bypassing Petrinja to neutralize ARSK artillery and missiles potentially targeting Croatian cities, making a secondary thrust from Sunja towards Hrvatska Kostajnica. Their secondary mission was compromised when a battalion of the special police and the 81st Guards Battalion planned to spearhead the advance were deployed elsewhere forcing modifications to the plan. The Zagreb Corps was composed of 30,000 troops, while the ARSK had 9,000 facing them and about 1,000 ARBiH troops in the Bihać pocket to their rear. At the start of Operation Storm, about 3,500 ARSK troops were in contact with the ARBiH. HV Bjelovar Corps, on the left flank of the Zagreb Corps, covering the area along the Una River, had a forward command post in Novska. The corps was commanded by Major General Luka Džanko. Opposite the Bjelovar Corps was a part of the ARSK Banija Corps. The Bjelovar Corps was included in the attack on 2 August and were therefore not issued a separate operations plan.