Upset at Adolf's participation in the crusade, Niklot preemptively invaded Wagria in June 1147, and, along with the Wagrians, murdered newly settled Fleming and Frisian villages, leading to the march of the crusaders in late summer 1147. By attacking first, Niklot gave further justification for the Crusade as he legitimized the Wends as a serious threat to Christendom. After expelling the Obodrites from his territory, Adolf signed a peace treaty with Niklot. The remaining Christian crusaders targeted the Obodrite fort Dobin and the Liutizian fort Demmin.