The Viking fleets began to return in the early years of the tenth century, bigger and now also driven by what seems to have been a lack of targets in the rest of Europe—there was not much mileage in Scandinavians attacking England, Ireland, or the Scottish isles unless it was in direct alliance with their countryfolk who were already there. In Frankia, the new raids were much more focussed than before and hit the estuary of the Seine repeatedly. The situation grew so quickly unstable that, following a battle at Chartres in 911, the Frankish king, Charles the Simple, was forced to negotiate
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