 Complete the following phrase:  In Slavonia, the first armed conflicts were clashes in Pakrac, and Borovo Selo near Vukovar. Western Slavonia was occupied in August 1991, following an advance by the Yugoslav forces north from Banja Luka across the Sava River. This was partially pushed back by the Croatian Army in operations named Otkos 10, and Orkan 91, which established a front line around Okučani and south of Pakrac that would hold virtually unchanged for more than three years until Operation Flash in May 1995. Armed conflict in the eastern Slavonia, culminating in the 