These Vikings would certainly be Norse, either detached from the following of Rolf Ganger, who wintered in England in 875 A.D. the year before his descent on Normandy; or else independent rovers who, like Rolf, had been driven from Norway by the high-handed methods of Harald Fairhair. Indeed, the time when a Norse contingent was not present with the English forces, from this period till at least that of the battle of Brunanburh in 947 A.D. would probably be an exception.