son Gottschalk expanded their realm by unifying the Obotrite tribes and conquering some Liutizi tribes in the 11th century. They encouraged the establishments of bishoprics to support Christian missionary activity. However, a revolt in 1066 led to the murder of Gottschalk and his replacement by the pagan Kruto of Wagria. Gottschalk's son Henry eventually killed Kruto in 1093. From 1140 to 1143 Holsatian nobles advanced into Wagria to permanently settle in the lands of the pagan Wagri. Count Adolf II of Holstein and Henry of Badewide took control of Polabian settlements at Liubice and Racisburg. Impressed with the success of the First Crusade, Saxons began calling for a crusade against their Slav neighbors. The Wendish Crusade of 1147, concurrent to the Second Crusade, was largely unsuccessful, resulting in devastation to the Liutizi lands and forced baptisms. The campaign did secure Saxon control of Wagria and Polabia, however. The Obotrites were largely at peace with the Saxons during the following decade, although Slavic pirates raided Denmark. Beginning in the late 1150s, King Valdemar the Great of Denmark enlisted the aid of Duke Henry the Lion of Saxony against the Slavs; their cooperation led to the death of the Obotrite prince, Niklot, in 1160. The two Christian lords distributed much of the conquered territory among their vassals. When Niklot's exiled son, Pribislav, engineered an Obotrite rebellion, the pair retaliated by occupying Demmin and warding off Pribislav's Liutizian allies. After conquering Wagria and Polabia during the 1140s, Saxon nobles attempted to expel the "native" Slavs and replace them with Saxon and Flemish settlers. The 1164 Obotrite revolt led by Niklot's son Pribislav convinced Henry the Lion that keeping the Slavs as allies would be less troublesome. The duke returned the Christian Pribislav to power as Prince of Mecklenburg, Kessin, and Rostock, and a vassal of the Saxons. Tactics and weaponry were decisive in Denmark's campaigns against the eastern Polabian Slavs. The Danes utilized quick coastal and river raids, tactics similar to those of the Vikings. Although they lacked siege experience, the Danes were able to cripple Slavic regions by burning crops and unwalled suburbs. Slav counterattacks were repulsed by crossbows and Norwegian longbows. The Danes occupied Rugia in 1168, conquering the Rani stronghold of Arkona. Similar to Henry's reinstatement of Pribislav as a Saxon vassal, Valdemar allowed the Rani prince Jaromar to rule as a Christian Danish vassal. After Valdemar refused to share