the Dvor area, where refugee columns were mixed with ARSK transporting heavy weapons and large quantities of ammunition. Overall, the CAF performed 67 close air support, three attack helicopter, seven reconnaissance, four combat air patrol and 111 transport helicopter sorties during Operation Storm. Other coordinated operations In order to protect areas of Croatia away from Sectors North and South, the HV conducted defensive operations while the HVO started a limited offensive north of Glamoč and Kupres to pin down part of the VRS forces, exploit the situation and gain positions for further advance. On 5 August, the HVO 2nd and 3rd Guards Brigades attacked VRS positions north of Tomislavgrad, achieving small advances to secure more favourable positions for future attacks towards Šipovo and Jajce, while tying down part of the VRS 2nd Krajina Corps. As a consequence of the overall battlefield situation, the VRS was limited to a few counter-attacks around Bihać and Grahovo as it was short of reserves. The most significant counter-attack was launched by the VRS 2nd Krajina Corps on the night of 11/12 August. It broke through the 141st Brigade, consisting of the HV's reserve infantry, reaching the outskirts of Bosansko Grahovo, only to be beaten back by the HV, using one battalion drawn from the 4th Guards and the 7th Guards Brigade each, supported by the 6th and the 126th Home Guard Regiments. Operation Phoenix In eastern Slavonia, the HV Osijek Corps was tasked with preventing ARSK or Yugoslav Army forces from advancing west in the region, and counter-attacking into the ARSK-held area around Vukovar. The Osijek Corps mission was codenamed Operation Phoenix (). The Corps commanded the 3rd Guards and 5th Guards Brigades, as well as six other HV brigades and seven Home Guard regiments. Additional reinforcements were provided in a form of specialized corps-level units otherwise directly subordinated to the HV General Staff, including a part of the Mi-24 gunship squadron. Even though artillery rounds and small arms fire were traded between the HV and the ARSK 11th Slavonia-Baranja Corps in the region, no major attack occurred. The most significant coordinated ARSK effort occurred on 5 August, when the exchange was compounded by three RSK air raids and an infantry and tank assault targeting Nuštar, northeast of Vinkovci. Operation Storm led the Yugoslav Army to mobilize and deploy considerable artillery, tanks and infantry to the border area near eastern Slavonia, but it took