As soon as all the forces were arrived Arthur marched forward to Augustodunum, and encamped on the banks of the river Alba. Here repeated battles were fought, in all which the Britons, under their valiant leaders, Hoel, Duke of Armorica, and Gawain, nephew to Arthur, had the advantage. At length Lucius Tiberius determined to retreat, and wait for the Emperor Leo to join him with fresh troops. But Arthur, anticipating this event, took possession of a certain valley, and closed up the way of retreat to Lucius, compelling him to fight a decisive battle, in which Arthur lost some of the bravest of his knights and most faithful followers. But on the other hand Lucius Tiberius was slain, and his army totally defeated. The fugitives dispersed over the country, some to the by-ways and woods, some to cities and towns, and all other places where they could hope for safety.
Arthur stayed in those parts till the next winter was over, and employed his time in restoring order and settling the government. He then returned into England, and celebrated his victories with great splendor.
Then the king stablished all his knights, and to them that were not rich he gave lands, and charged them all never to do outrage nor murder, and always to flee treason; also, by no means to be cruel, but to give mercy unto him that asked mercy, upon pain of forfeiture of their worship and lordship; and always to do ladies, damosels, and gentlewomen service, upon pain of death. Also that no man take battle in a wrongful quarrel, for no law, nor for any world’s goods. Unto this were all the knights sworn of the Table Round, both old and young. And at every year were they sworn at the high feast of Pentecost.
While the army was encamped in Brittany, awaiting the arrival of the kings, there came a countryman to Arthur, and told him that a giant, whose cave was on a neighboring mountain, called St. Michael’s Mount, had for a long time been accustomed to carry off the children of the peasants to devour them. “And now he hath taken the Duchess of Brittany, as she rode with her attendants, and hath carried her away in spite of all they could do.” “Now, fellow,” said King Arthur, “canst thou bring me there where this giant haunteth?” “Yea, sure,” said the good man; “lo, yonder where thou seest two great fires, there shalt thou find him, and more treasure than I suppose is in all France beside.” Then the king called to him Sir Bedver and Sir Kay, and commanded them to make ready horse and harness for himself and them; for after evening he would ride on pilgrimage to St. Michael’s Mount.