"Liar and traitor," cried Sir Gawaine, "you are a traitor both to the king and to me."
Launcelot replied, "I see that never again shall I have your love, though I pray you remember that at one time we were friends, and that once you were indebted to me for your life."
"I care not," said Sir Gawaine, fiercely; "nor do I care for the friendship of the king. As for you, in open combat or by stealth, your life will I have; and as for the king, if he will not aid me now I shall leave his kingdom and fight even against him."
"Cease this brawling before me," said the king. "It is better for us all that Launcelot should depart." Thus was Arthur's greatest knight banished from the kingdom.
This, however, did not terminate the difficulty. Arthur and Gawaine followed Launcelot to France, where in a terrible battle Gawaine was unhorsed and borne to the ground by Sir Launcelot, who, however, declined to kill the valiant knight, although Gawaine still accused him of being a traitor and declared that his enmity should never cease while life lasted. Launcelot had gathered a large following in France, and while Gawaine was being healed of his wounds there was peace between the armies.
In the meantime, Sir Mordred, the traitorous nephew of King Arthur, remained in England and instigated a rebellion against the king. He summoned a parliament and caused himself to be elected king. Queen Guinevere hid herself in the tower of London and could not be induced to leave by threat or entreaty, for she knew that Mordred's purpose was to make her his wife.
This news came to Arthur while he was encamped at Benwick where the battle between his forces and Launcelot's had taken place. Arthur immediately gathered his forces together and set sail for Britain. Mordred learned of his approach and gathered a great army at Dover, where he expected Sir Arthur to arrive, and where he lay in wait in the harbor with a great array of ships of all kinds.
Nothing daunted King Arthur, however, and in a fierce naval battle the forces of Mordred were defeated, while the traitor fled westward, where he gathered his scattered hosts. There were among his men many of King Arthur's favorite knights, men whom he had showed every favor and who were indebted to him for all that they possessed. The desertion of these men made Arthur sorry at heart and left him little joy in his successful battle. As soon as he could he landed and went about among the wounded of his own army and of his enemies, binding up their wounds and giving comfort to those who were dying. The dead he buried with honors of war whether they were his opponents or his friends.
As he went about among the boats he espied Sir Gawaine lying more dead than alive, for in the battle he had received a blow which had reopened the wound Launcelot had given him. When Arthur saw Gawaine he cried to the stricken knight, "My sister's son, here you lie at the point of death, the one man in the world I love most. Now is my joy all gone. Sir Launcelot had all my friendship and you all my love, both of which are gone utterly from me. Now indeed is my earthly joy all departed."
"My uncle, King Arthur," said Gawaine, "you know that this is my death day, and that all has come through my own hastiness; for now am I smitten on an old wound which Sir Launcelot gave me, and I know well I must die. If Sir Launcelot had been with you, this unhappy war had never begun. Now am I the cause of all this, for now I know it was Sir Launcelot that kept his enemies in subjection. I could not join in friendship with him while I lived, but now as I die I pray you give me paper, pen and ink that I may write to Launcelot with mine own hand."