910 - Battle of Tettenhall

England
Edward the Elder with forces from Mercia and Wessex defeated an army of Northumbrian Danelaw Vikings at he Battle of Tettenhall. The Northumbrian Kings Halfdan and Eowils were killed and the viking army suffered heavy casualties.
France
Aa large fleet of the survivor sailed over from England to Brittany under the leadership of the Viking Earls Ottar and Harald. Ottar and Harald looted an pillaged in Brittany for four years before they travelled back to the British Islands.