|Angus McBride:9th century viking warriors|
|A York Penny|
The Battle of Brissarthe was fought on the 2 July 866, between the Franks and a combined Breton and Viking army near Brissarthe, Neustria. It was marked by the two deaths of Robert the Strong, the Neustrian count, and Ranulf I, the duke of Aquitaine.
In 866, Salomon, Duke of Brittany, allied with Hastein (Hasting), a Danish chieftain, formed an expedition into Anjou, Maine, and Touraine. In the course of the campaign, Le Mans was sacked. Robert, commander of the local area, assembled a large army to expel them. He was joined by Ranulf of the region of Poitou and Gauzfrid and Hervé of Maine.
The Danes attempted to take refuge in a local church, but the Franks besieged them. During the night, the Danes attempted to break out. During the ensuing battle, Robert the strong was killed, Ranulf was mortally wounded by arrows, and Hervé injured. and the Franks had to retreat. Vikings escaped.
Viking Camp at Youghal(Cork) and camps between Cenel neogain and Araide(uncertain location) Port Manann(uncertain location), King Aed Findiliath destroyed viking camps in Northern Ireland.
Harald Fairhair (850–933) won a decisive battle in his quest to become king of whole Norway.