Mobile Viking bands fought the forces of the three imperial claimants, singly or sometimes in alliance. They also raided local municipalities and took on the militias, or just whatever ragtag defence the peasantry could muster in the face of indifferent central leadership. Vikings were also hired as mercenaries by any and all of these factions, to fight their civil enemies or even other Vikings; in many cases, the Scandinavians then pooled their forces to turn on their erstwhile employers. None of this took place in a vacuum of knowledge, nor was it a matter of haphazard reaction: the Vikings
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