At this time the Ciarraige besieged the followers of that Tomrar, and since they had prayed to Brénaind at the edge of the sea, the Lord was helping the Irish: for the sea was drowning the Norwegians, and the Ciarraige were slaying them. Old Congal, king of the Ciarraige, took the victory in this conflict. A few of the Norwegians escaped, naked and wounded; great quantities of gold and silver and beautiful women were left behind.
In this year, moreover, Norwegian forces came from the port of Corcach to plunder Fir Maige Féine, but God did not allow them to do that. For at that time, the Déissi came raiding into the same territory, by God's providence, since the Déissi and the Fir Maige were bitter enemies before then. When the Déissi saw the Norwegians plundering and devastating the land, they came to the Fir Maige, and they made a firm and lasting peace, and together they attacked the Norwegians fiercely and actively and pugnaciously, and there was hard and vigorous fighting between them on both sides. Nevertheless the Norwegians were defeated, by a miracle of the Lord, and they were slaughtered.
However, their leader, whose name was Gním Cinnsiolaigh, fled until he reached a strong castle that was near them, and he attempted to take it, but in vain, since he could not stand the number of javelins and stones that were being cast at him. What he did was to summon Cenn Fáelad to him, because he thought that he was an ally, and he promised him many presents in exchange for protecting him; but this availed him nothing, for he was dragged out, at the entreaty of the multitude who had served him before, and he was miserably killed, and all his followers were slain. Shortly after that, moreover, people came to the castle in which he had passed his life lustfully, and it was totally demolished. Thus it pleased God.
866 Kl. Dínertach, abbot of Lothra, died.
866 Loch Lebinn turned into blood, so that it became clots of gore like lungs.
866 Sruthair, Sléibte, and Achad Arglais were laid waste by the heathens.
?867 In this year, the sixth year of the reign of Áed son of Niall, there was a defeat of the Uí Néill by the Laigin, in which Máel Muad son of Dúnchad and Máel Murthemne son of Máel Brigte fell.
867 There was an encounter between Óisle, son of the king of Norway, and Amlaib, his brother. The king had three sons: Amlaib, Imar, and Óisle. Óisle was the least of them in age, but he was the greatest in valor, for he outshone the Irish in casting javelins and in strength with spears. He outshone the Norwegians in strength with swords and in shooting arrows. His brothers loathed him greatly, and Amlaib the most; the causes of the hatred are not told because of their length. The two brothers, Amlaib and Imar, went to consult about the matter of the young lad Óisle; although they had hidden reasons for killing him, they did not bring these up, but instead they brought up other causes for which they ought to kill him; and afterwards they decided to kill him.
When Amlaib learned that the party of the brother he hated had arrived, what he did was to send trusted messengers for the strongest and most vigorous horsemen he had, that they might be in the house to meet Óisle. Then Óisle came, the handsomest and bravest man in the world at that time; now he came into his brother's house with few attendants, for he did not expect what he found there (i.e. to be killed). What he sought there, moreover, was something that he did not expect to get. First he asked that liberty of speech be given him. That was granted. This is what he said: ‘Brother,’ he said, ‘if your wife, i.e. the daughter of Cináed, does not love you, why not give her to me, and whatever you have lost by her, I shall give to you.’
When Amlaib heard that, he was seized with great jealousy, and he drew his sword, and struck it into the head of Óisle, his brother, so that he killed him. After that all rose up to fight each other (i.e. the followers of the king, Amlaib, and the followers of the brother who had been killed there); then there were trumpets and battle-cries on both sides. After that the camp of the slain brother was attacked, his followers having been slaughtered. There were many spoils in that camp.
867 In this year the Danes went to York, and battled hard with the Saxons there. The Saxons were defeated, and the king of the Saxons, i.e., Aelle, was slain there through the deceit and treachery of a young lad of his own household. There was great slaughter in that battle, and afterwards York was attacked, and much of every kind of booty was taken from it— for it was rich at that time—and the noblemen who were captured there were put to death. It was from that that every misfortune and every harassment of the island of Britain arose.
867 In this year the famous Cennétig (i.e. the son of Gáethíne), renowned enemy of the Norwegians, came to attack the encampment of Amlaib, king of the Norwegians (and it was he above who killed his brother), and he burned it ... The Norwegians came after him, and when he turned to face them, he drove them in defeat back to the same camp, and slaughtered their noblemen. Thus it pleased God.
In this year, moreover, Earl Bárith and Háimar, two men of a noble family of the Norwegians, came through the center of Connacht towards Luimnech, as if they would do nothing to the Connachtmen. Nevertheless, that was not how it happened, for they trusted not in numbers, but rather in their own strength. The Connachtmen proceeded to overcome them by ambush; for at that time there happened to be a certain Munster man among them strong and hard and clever in the use of weapons, and that Munster man, moreover, was clever at making plans. The Connachtmen asked him to go to the Norwegians, as if he were going to guide them, and to kill Bárith.
When he came to the place where Háimar was, he stabbed Háimar forcefully with a javelin, and he killed him. But a Connacht soldier who accompanied him in order to kill Bárith did not happen to do as he desired, for he was wounded in his thigh, and he barely escaped afterwards. Then the Connachtmen attacked the Norwegians and slaughtered the Norwegians, but it would not have been thus if the woods and the night had not been near. They returned afterwards to the place from which they had come, and did not go to Luimnech.
857 Kl. Máel Dúin son of Áed, king of Ailech, died in orders.
867 Robartach, bishop and scholar of Finnglas, died.
867 Coscrach of Tech Telli died.
867 Conall of Cell Scíre, a bishop, rested.
867 Cormac grandson of Liathán, bishop and anchorite, rested.
867 Oegedchair, abbot of Condere and Lann Ela, rested.
867 Guaire son of Dub dá Bairenn died.
867 Muiredach son of Cathal, king of Uí Cremthainn, died of long paralysis.
Dúnchad son of Dúngal died.
867 Canannán son of Cellach was treacherously killed by the son of Gáethíne.