How King Arthur at the request of Sir Gawaine concluded to make war against Sir Launcelot, and laid siege to his castle called Joyous Gard. Alas, said Sir Gawaine, now is my joy gone. And then he fell down and swooned, and long he lay there as he had been dead. And then, when he arose of his swoon, he cried out sorrowfully, and said: Alas! And right so Sir Gawaine ran to the king, crying and weeping: O King Arthur, mine uncle, my good brother Sir Gareth is slain, and so is my brother Sir Gaheris, the which were two noble knights. Then the king wept, and he both; and so they fell a-swooning. And when they were revived then spake Sir Gawaine: Sir, I will go see my brother, Sir Gareth. Ye may not see him, said the king, for I caused him to be interred, and Sir Gaheris both; for I well understood that ye would make over-much sorrow, and the sight of Sir Gareth should have caused your double sorrow. Alas, my lord, said Sir Gawaine, how slew he my brother, Sir Gareth? Mine own good lord I pray you tell me. Truly, said the king, I shall tell you how it is told me, Sir Launcelot slew him and Sir Gaheris both. Alas, said Sir Gawaine, they bare none arms against him, neither of them both. I wot not how it was, said the king, but as it is said, Sir Launcelot slew them both in the thickest of the press and knew them not; and therefore let us shape a remedy for to revenge their deaths.
My king, my lord, and mine uncle, said Sir Gawaine, wit you well now I shall make you a promise that I shall hold by my knighthood, that from this day I shall never fail Sir Launcelot until the one of us have slain the other. And therefore I require you, my lord and king, dress you to the war, for wit you well I will be revenged upon Sir Launcelot; and therefore, as ye will have my service and my love, now haste you thereto, and assay your friends. For I promise unto God, said Sir Gawaine, for the death of my brother, Sir............