"My most gracious lord and my uncle," said Sir Gawaine, "wit you well that now I shall make you a promise, the which I shall hold by my knighthood, that from this day I shall never fail Sir Launcelot, until the one of us hath slain the other; and therefore I require you, my lord and my king, dress you unto the war, for wit you well I shall be revenged upon Sir Launcelot. For I promise unto God," said Sir Gawaine, "for the death of my brother Sir Gareth I shall seek Sir Launcelot throughout seven kings' realms but I shall slay him, or else he shall slay me."
"Ye shall not need to seek him so far," said the king, "for, as I hear say, Sir Launcelot will abide me and you in the Joyous Gard, and much people draweth unto him as I hear say."
Then came King Arthur and Sir Gawaine with an huge host, and laid a siege about Joyous Gard, both at the town and at the castle; and there they made full strong war on both parties. But in no wise Sir Launcelot would not ride out nor go out of the castle of a long time, neither he would suffer none of his good knights to issue out, neither none of the town nor of the castle, until fifteen weeks were past.
So it befell on a day in harvest that Sir Launcelot looked over the walls and spake on high to King Arthur and Sir Gawaine: "My lords both, wit ye well it is in vain that ye labor at this siege, for here win ye no worship but dishonor."
"Come forth," said King Arthur unto Sir Launcelot, "and thou darest, and I promise thee I shall meet thee in the midst of the field."
"God defend me," said Sir Launcelot, "that ever I should encounter with the most noble king that made me knight."
"Fie upon thy fair language," said the king, "for wit you well, and trust it, I am thy mortal foe, and ever will to my death day, for thou hast slain my good knights and full noble men of my blood, that I shall never recover again: also thou hast dishonored my queen, and holden her many winters, and like a traitor taken her from me by force."
"My most noble lord and king," said Sir Launcelot, "ye may say what ye will, for ye wot well with yourself I will not strive, but there as ye say I have slain your good knights, I wot well that I have done so, and that me sore repenteth, but I was enforced to do battle with them, in saving of my life, or else I must have suffered them to have slain me. And as for my lady Queen Guenever, ofttimes, my lord, ye have consented that she should be burnt and destroyed in your heat, and then it fortuned me to do battle for her, and or I departed from her adversary they confessed their untruth, and she full worshipfully excused. And at such times, my lord Arthur," said Sir Launcelot, "ye loved me, and thanked me when I saved your queen from the fire, and then ye promised me for ever to be my good lord, and now me thinketh ye reward me full ill. For sithence I have done battles for your queen in other quarrels than in mine own, me seemeth now I had more right to do battle for her in a right quarrel. And therefore my good and gracious lord," said Sir Launcelot, "take your queen unto your good grace, for she is both fair, true, and good."
"Fie on thee, false recreant knight," said Sir Gawaine, "I let thee to wit that my lord mine uncle King Arthur shall have his queen and thee maugre [in spite of] thy visage, and slay you both whereas it shall please him."