All this language Sir Launcelot heard, and then he said thus, "Sir Gawaine, me repenteth of your foul saying, that ye will not cease of your language, for wit ye well, Sir Gawaine, I know your might, and all that ye may do, and well ye wot, Sir Gawaine, ye may not greatly hurt me."
"Come down, traitor knight," said he, "and make it good the contrary with thy hands; for it mishapped me the last battle to be hurt of thy hands, therefore wit thou well, that I am come this day to make amends, for I ween this day to lay thee as low as thou laidest me."
"Defend me," said Sir Launcelot, "that ever I be so far in your danger as ye have been in mine, for then my days were done. But Sir Gawaine," said Sir Launcelot, "ye shall not think that I tarry long; but sithence that ye so unknightly call me of treason, ye shall have both your hands full of me."
And then Sir Launcelot armed him at all points, and mounted upon his horse, and gat him a great spear in his hand, and rode out at the gate. And both the hosts were assembled of them without and of them within, and stood in array full manly; and both parties were charged for to hold them still to see and behold the battle of these two noble knights. And then they laid their spears in their rests, and they ran together as thunder. And Sir Gawaine brake his spear upon Sir Launcelot in an hundred pieces unto his hand. And Sir Launcelot smote him with a greater might, that Sir Gawaine's horse's feet raised, and so the horse and he fell to the earth. Then Sir Gawaine full quickly avoided his horse, and put his shield before him, and eagerly drew his sword, and bade Sir Launcelot "alight, traitor knight! for though this mare's son hath failed me, wit thou well that a king's son and a queen's son shall not fail thee."
Then Sir Launcelot avoided his horse, and dressed his shield before him, and drew his sword. And so they stood together and gave many sad strokes, that all men on both parties had thereof passing great wonder. But when Sir Launcelot felt Sir Gawaine's might so marvellously increased, he then withheld his courage and his wind, and kept himself wondrous covert of his might, and under his shield he traced and traversed here and there for to break Sir Gawaine's strokes and his courage. And Sir Gawaine enforced him with all his might and power to destroy Sir Launcelot, for ever as Sir Gawaine's might increased, right so increased his wind and his evil will. Thus Sir Gawaine did great pain unto Sir Launcelot three hours continually, that Sir Launcelot had great pain to defend himself. And after that the three hours were passed, then Sir Launcelot felt verily that Sir Gawaine was come to his own proper might and strength, and that his great power was done. Then Sir Launcelot said unto Sir Gawaine, "Now have I well proved you twice, that ye are a full dangerous knight, and a wonderful man of your might, and many wonderful deeds have you done in your days: for by your might increasing you have deceived many a full noble and valiant knight; and now I feel that ye have done your mighty deeds. Now wit you well I must do my deeds."
And then Sir Launcelot stood near Sir Gawaine, and then Sir Launcelot doubled his strokes, and Sir Gawaine defended him mightily. But nevertheless Sir Launcelot smote such a stroke upon Sir Gawaine's helm, and upon the old wound, that Sir Gawaine sank down upon his one side in a swoon. And anon as he was awake, he waved and foined at Sir Launcelot as he lay, and said, "Traitor knight, wit thou well I am not yet slain: come thou near me, and perform this battle unto the uttermost."
"I will no more do than I have done," said Sir Launcelot; "for when I see you on foot I will do battle upon you all the while I see you stand on your feet; but for to smite a wounded man that may not stand, God defend me from such a shame."
And then he turned him and went his way towards the city, and Sir Gawaine evermore calling him traitor knight, and said, "Wit thou well, Sir Launcelot, when I am whole, I shall do battle with thee again; for I shall never leave thee till that one of us be slain."
Thus as this siege endured, and as Sir Gawaine lay sick near a month, and when he was well recovered and ready within three days to do battle again with Sir Launcelot, right so came tidings unto King Arthur from England, that made King Arthur and all his host to remove.