The Wendish Crusade was launched on summer 1147, with the combined Crusader armies of SaxonyBremen and Magdeburg led by Henry III.[2]Adalbert II of Bremen would be among the commanders.[3] The Danish fleet of Canute V and Sweyn III also jointed the crusade, temporarily halting their rivalry over the right to Danish throne.[1][2] This combined Crusader army would go on to besiege Obotrite fortress of Dobin, while another part of the Crusader forces of the Holy Roman Empire would end up unsuccessfully besieging Demmin. The primarily goal of the Crusade appeared to be plunder and subjugation of the WendishSlavic pagan lands, alongside forced conversion of the Slavic pagans to Catholicism.[2] The Crusader army likely consisted of 15,000–25,000 troops, while the Dobin garrison would've had a force of 3,000–6,000.
Siege
Obotrite leader Niklot fortified himself to the north Elber river, at the small fortress of Dobin after carrying out his raids. The Danes intended to sail from Denmark to the north of the fortress and then proceed with their assault on land. The combined army of Henry III was going to attack from the direction of Saxony. The Saxon-Danish forces were planning to surround and take the Dobin garrison by surprise.[4]
As the Saxon army of Henry begun their assaults, but their attacks were constantly repelled and the Saxon forces were tied up besieging the Dobin fortress. The Danish navy was meant to strike from the north, but they were unexpectedly attacked by the Slavic Rani fleet, with Danish troops that managed to land getting ambushed by the Wendish forces. These surprise attacks prevented the Danes from providing support for the Saxons, which were tied up at Dobin and relied on Danes to turn the tied of this siege.[4] The Danish forces suffered heavy defeats at the Bay of Wismar and on land, forcing them to retreat.[2][4][5] Some elements of the Saxon army wanted to ravage the countryside in order to force the Dobin garrison to capitulate, but this decision was overturned by their commanders, with one of them stating: "Is not the land we are devastating our land, and the people we are fighting our people?".[3][4]
Aftermath
The siege of unsuccessful from a military point of view.[1][2]Niklot managed to force the Saxon-Danish Crusader army to retreat.[4] Politically, the Crusaders managed to negotiate conversion of Dobrin garrison in exchange for leaving the Wendish lands. This had proven to be a temporary and incomplete political success, as the Wends would shortly return to their pagan practices. The Wendish Crusade would get criticised by Bernard of Clairvaux for failing to achieve mass conversion of the Slavic pagans.[3] The Crusade ended up having uncertain results and wasn't able to achieve its immediate objectives.
References
123Jason Roche (2015). "The Second Crusade, 1145-49: Damascus, Lisbon and the Wendish Campaigns". Manchester Metropolitan University. A combined Saxon army was headed by Duke Henry the Lion and supported by the Danish fleets of the rival kings Knud V and Svend III. This force unsuccessfully besieged the remote and newly fortified pagan Abodrite outpost at Dobin on Lake Schwerin in July 1147.
↑Alan V. Murray (2006). The Crusades: An Encyclopedia. Vol.1. ABC-CLIO. p.1267. ISBN9798400634727.
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Duchy of Saxony 
Archbishopric of Bremen 
Archbishopric of Magdeburg 
Kingdom of Denmark 
Slavic Obotrites