Around the year 982, Imperial authority in Slavic territory extended as far east as the Lusatian Neisse River and as far south as the Ore Mountains. Following the defeat of Otto II at Stilo in 983, the Lutici Federation of Polabian Slavs revolted against their German overlords, sparking the Great Slav Rising ("Slawenaufstand"). The Polabian Slavs destroyed the bishoprics of Havelberg and Brandenburg. According to the German chronicler Bishop Thietmar of Merseburg, the decades-long forced Germanization and Christianization of the Slavs associated with these two churches was the reason for their destruction. Thietmar blames the uprising on maltreatment of the Slavs by the Germans: "Warriors, who used to be our servants, now free as a consequence of our injustices." In the Obotrite territories along the Elbe River, the Luticians initiated a revolt aimed at the abolition of feudal rule and Christianity, drawing upon considerable support by the Obodrite populace and their leader Mstivoj. In part, the Obodrite revolt was successful: The princely family, though in part remaining Christian, dissolved Christian institutions.