▁German ▁gover ning ▁practice : ▁a ▁change ▁from ▁over l ord ship , ▁which ▁the ▁S lav s ▁were ▁willing ▁to ▁accept , ▁to ▁lord ship , ▁which ▁the ▁S lav s ▁protest ed . ▁ ▁D end rod ates ▁reve al ▁that ▁in ▁the ▁context ▁of ▁the ▁Sax on - Ob ot rite ▁conflict , ▁the ▁S lav s ▁in ▁present - day ▁n ortheast ▁Germany ▁started ▁to ▁build ▁lots ▁of ▁for ts ▁– ▁only ▁few ▁for ts ▁were ▁built ▁before . ▁A ▁second ▁phase ▁of ▁extensive ▁fort ▁construction ▁occurred ▁in ▁the ▁ 9 8 0 s , ▁in ▁the ▁context ▁of ▁the ▁great ▁u pr ising ▁of ▁ 9 8 3 . ▁ ▁Contempor ary ▁accounts ▁ ▁The ▁course ▁of ▁the ▁battle ▁is ▁described ▁in ▁W id uk ind ▁of ▁Cor vey ' s ▁chron icle ▁R er um ▁gest ar um ▁Sax onic ar um ▁lib . ▁III ▁c . ▁L III - L V ▁and , ▁in ▁less ▁detail , ▁in ▁Th iet mar ▁of ▁Mer se burg ' s ▁Chron icon ▁lib . ▁II . 1 2 . ▁Short ▁mentions ▁of ▁the ▁battle ▁are ▁recorded ▁in ▁the ▁respective ▁paragraph s ▁about ▁the ▁year ▁ 9 5 5 ▁in ▁the ▁continu ation ▁of ▁the ▁ann als ▁of ▁Pr ü m ▁Ab bey ▁and ▁the ▁ann als ▁of ▁St . ▁G allen ▁Ab bey . ▁ ▁Location ▁ ▁S ources ▁are ▁vague ▁about ▁the ▁site ▁of ▁the ▁battle . ▁W id uk ind ▁of ▁Cor vey ▁said ▁the ▁battle field