At the head of the confederacy which was now combining to wrest Northumbria from the grasp of Athelstan, were Constantine and the two Olaves, the great-grandsons of the Danish Ivar, one of whom, the son of Sitric, was the son-in-law of the Scottish king, and the other, the son of Godfrey, had succeeded his father three years previously in the government of the Irish Norsemen.[72] A British prince, to whom the Saga gives the name of Adills, a chieftain probably of the northern Welsh, together with Yring, a Norseman from his name, though described by the same authority as also of British race, joined the ranks of Athelstan’s opponents, and Eogan, the son of the Scottish Donald, in obedience to his allegiance to his kinsman and chief, led his followers from the vale of Clyde to swell the numbers of the allies. To aid in opposing this formidable array, Athelstan had invoked the assistance of the Vikings, and the pagan rovers of the German Ocean now marched side by side in the English host with the Angles of Mercia, the Saxons of Wessex, and the Christian descendants of Guthrum’s Danes. The advantage at first leant to the side of the invaders, for in spite of his preparations for the impending contest, Athelstan appears to have been partly taken by surprise. Alfgar and Godric, his lieutenants in Northumbria, were either driven from the field or slain, and the English king was reduced to negociate with the enemy in order to gain time for the union of his whole force. The negociations were quickly broken off when the required end was attained, and after the failure of a night attack, skilfully planned by Olave Sitricson, who is said to have visited the camp of Athelstan in the disguise of a wandering harper, the rival armies met upon the long-forgotten site of Brunanburgh. The victors alone have described that celebrated battle; and whilst the Saga, forgetful alike of the English and Scottish kings, awards the palm to the Norsemen in the pay of Athelstan, the ancient ballad in the Saxon Chronicle extols the deeds of the native warriors, and renders full justice to the valour of Constantine and Olave. Five kings and seven Jarls, a son of Constantine, and two brothers of Athelstan, were left amongst the slain upon the field of Brunanburgh; and whilst the baffled survivors of the Irish Norsemen returned in their galleys to Dublin, and the remnants of the Scots with their sorrowing king mournfully withdrew beyond the Forth, the unchallenged dominion of the whole of Saxon England, the submission of the Welsh and of the Northumbrian Danes, and the alliance and admiration of Flanders, France, and Germany, rewarded the victor of this glorious day.[73]