After the death of Utherpendragon, the leaders of the Britons assembled from their various provinces in the town of Silchester and there suggested to Dubricius, the Archbishop of the City of the Legions, that as their King he should crown Arthur, the son of Uther. Necessity urged them on, for as soon as the Saxons heard of the death of King Uther, they invited their own countrymen over from Germany, appointed CoIgrin as their leader and began to do their utmost to exterminate the Britons. They had already over-run all that section of the island which stretches from the River Humber to the sea named Caithness.

Dubricius lamented the sad state of his country. He called the other bishops to him and bestowed the crown of the kingdom upon Arthur. Arthur was a young man only fifteen years old; but he was of outstanding courage and generosity, and his inborn goodness gave him such grace that he was loved by almost all the people. . . . In Arthur courage was closely linked with generosity, and he made up his mind to harry the Saxons, so that with their wealth he might reward the retainers who served his own household. The justness of his cause encouraged him, for he had a claim by rightful inheritance to the kingship of the whole island. He therefore called together all the young men whom I have just mentioned and marched on York.

As soon as this was announced to CoIgrin, he assembled the Saxons, Scots and Picts, and came to meet Arthur with a vast multitude. Once contact was made between the two armies, beside the River Douglas, both sides stood in grave danger for their lives. Arthur, however, was victorious. Colgrin fled, and Arthur pursued him; then Colgrin entered York and Arthur besieged him there.

Arthur pursued the Saxons relentlessly until they reached Caledon Wood. There they re-formed after their flight and made an effort to resist Arthur. The Saxons joined battle once more and killed a number of the Britons, for the former defended themselves man-fully. They used the shelter of the trees to protect themselves from the Britons' weapons. As soon as Arthur saw this, he ordered the trees round that part of the wood to be cut down and their trunks to be placed in a circle, so that every way out was barred to the enemy. Arthur's plan was to hem them in and then besiege them, so that in the end they should die of hunger. When this had been done, he ordered his squadrons to surround the wood and there he remained for three days. The Saxons had nothing at all to eat. To prevent themselves dying of sheer hunger, they asked permission to come out, on the understanding that, if they left behind all their gold and silver, they might be permitted to return to Germany with nothing but their boats. What is more, they promised that they would send Arthur tribute from Germany and that hostages should be handed over. Arthur took counsel and then agreed to their petition. He retained all their treasure, and took hostages to ensure that the tribute should be paid. All that he conceded to the Saxons was permission to leave.

As the Saxons sailed away across the sea on their way home, they repented of the bargain which they had made. They reversed their sails, turned back to Britain and landed on the coast near Totnes. They took possession of the land, and depopulated the countryside as far as the Severn Sea, killing off a great number of the peasantry. Then they proceeded by a forced march to the neighbourhood of Bath and besieged the town. When this was announced to King Arthur, he was greatly astonished at their extraordinary duplicity. He ordered summary justice to be inflicted upon their hostages, who were all hanged without more ado. He put off the foray with which he had begun to harass the Scots and the Picts, and he hastened to break up the siege. . . . He finally reached the county of Somerset and approached the siege. 'Although the Saxons, whose very name is an insult to heaven and detested by all men, have not kept faith with me,' he said, 'I myself will keep faith with my God. This very day I will do my utmost to take vengeance on them for the blood of my fellow countrymen. Arm yourselves, men, and attack these traitors with all your strength! With Christ's help we shall conquer them, without any possible doubt!'

As Arthur said this, the saintly Dubricius, Archbishop of the City of the Legions, climbed to the top of a hill and cried out in a loud voice: 'You who have been marked with the cross of the Christian faith, be mindful of the loyalty you owe to your father-land and to your fellow countrymen! If they are slaughtered as a result of this treacherous behaviour by the pagans, they will be an everlasting reproach to you, unless in the meanwhile you do your utmost to defend them! Fight for your fatherland, and if you are killed suffer death willingly for your country's sake. That in itself is victory and a cleansing of the soul. Whoever suffers death for the sake of his brothers offers himself as a living sacrifice to God and follows with firm footsteps behind Christ Himself, who did not disdain to lay down His life for His brothers. It follows that if any one of you shall suffer death in this war, that death shall be to him as a penance and an absolution for all his sins, given always that he goes to meet it unflinchingly.'

Without a moment's delay each man present, inspired by the benediction given by this holy man, rushed off to put on his armour and to obey Dubricius' orders. Arthur himself put on a leather jerkin worthy of so great a king. On his head he placed a golden helmet, with a crest carved in the shape of a dragon; and across his shoulders a circular shield called Pridwen, on which there was painted a likeness of the Blessed Mary, Mother of God, which forced him to be thinking perpetually of her. He girded on his peerless sword, called Caliburn, which was forged in the Isle of Avalon. A spear called Ron graced his right hand: long, broad in the blade and thirsty for slaughter. Arthur drew up his men in companies and then bravely attacked the Saxons, who as usual were arrayed in wedges. All that day they resisted the Britons bravely, although the latter launched attack upon attack. Finally, towards sunset, the Saxons occupied a neighbouring hill, on which they proposed to camp. Relying on their vast numbers, they considered that the hill in itself offered sufficient protection. However, when the next day dawned, Arthur climbed to the top of the peak with his army, losing many of his men on the way. Naturally enough, the Saxons, rushing down from their high position, could inflict wounds more easily, for the impetus of their descent gave them more speed than the others, who were toiling up. For all that, the Britons reached the summit by a superlative effort and immediately engaged the enemy in hand-to-hand conflict. The Saxons stood shoulder to shoulder and strove their utmost to resist.

When the greater part of the day had passed in this way, Arthur went berserk, for he realized that things were still going well for the enemy and that victory for his own side was not yet in sight. He drew his sword Caliburn, called upon the name of the Blessed Virgin, and rushed forward at full speed into the thickest ranks of the enemy. Every man whom he struck, calling upon God as he did so, he killed at a single blow. He did not slacken his onslaught until he had dispatched four hundred and seventy men with his sword Caliburn.