isolating pockets of resistance and placing the 1st Guards Brigade in a position that allowed it to move north into the Karlovac Corps AOR, pushing ARSK forces towards Banovina. The defeat of the ARSK at Glina and Petrinja, after heavy fighting, also defeated the ARSK Banija Corps, as its reserve became immobilized by the ARBiH. The ARSK force was capable of containing or substantially holding assaults by regular HV brigades and the Home Guard, but attacks by the Guards brigades and the special police proved to be decisive. Colonel Andrew Leslie, commanding the UNCRO in the Knin area, assessed Operation Storm as a textbook operation that would have "scored an A-plus" by NATO standards. Even if the ARBiH had not provided aid, the HV would almost certainly have defeated the Banija Corps on its own, albeit at greater cost. The lack of reserves was the ARSK's key weakness that was exploited by the HV and the ARBiH since the ARSK's static defence could not cope with fast-paced attacks. The ARSK military was unable to check outflanking manoeuvres and their Special Units Corps failed as a mobile reserve, holding back the HV's 1st Guards Brigade south of Slunj for less than a single day. The ARSK traditionally counted on the VRS and the Yugoslav military as its strategic reserve, but the situation in Bosnia and Herzegovina immobilized the VRS reserves and Yugoslavia did not intervene militarily as Milošević did not order it to do so. Even if he had wished to intervene, the speed of the battle would have allowed a very limited time for Yugoslavia to deploy appropriate reinforcements to support the ARSK. Refugee crisis The evacuation and following mass-exodus of the Serbs from the RSK led to a significant humanitarian crisis. In August 1995, the UN estimated that only 3,500 Serbs remained in Kordun and Banovina (former Sector North) and 2,000 remained in Lika and Northern Dalmatia (former Sector South), while more than 150,000 had fled to Yugoslavia, and between 10,000 and 15,000 had arrived in the Banja Luka area. The number of Serb refugees was reported to be as many as 200,000 by the international media and international organizations. Also, 21,000 Bosniak refugees from the former APWB fled to Croatia. While approximately 35,000 Serb refugees, trapped with the surrendered ARSK Kordun Corps, were evacuated to Yugoslavia via Sisak and the Zagreb–Belgrade motorway, the bulk of the refugees followed