ALAS, said the king, that ever this unhappy war was begun; for ever Sir Launcelot forbeareth me in all places, and in likewise my kin, and that is seen well this day by my nephew Sir Gawaine. Then King Arthur fell sick for sorrow of Sir Gawaine, that he was so sore hurt, and because of the war betwixt him and Sir Launcelot. So then they on King Arthur's part kept the siege with little war withoutforth; and they withinforth kept their walls, and defended them when need was. Thus Sir Gawaine lay sick three weeks in his tents, with all manner of leech-craft that might be had. And as soon as Sir Gawaine might go and ride, he armed him at all points, and start upon a courser, and gat a spear in his hand, and so he came riding afore the chief gate of Benwick; and there he cried on height: Where art thou, Sir Launcelot? Come forth, thou false traitor knight and recreant, for I am here, Sir Gawaine, will prove this that I say on thee.

All this language Sir Launcelot heard, and then he said thus: Sir Gawaine, me repents of your foul saying, that ye will not cease of your language; for you wot 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 I am come this day to make amends, for I ween this day to lay thee as low as thou laidest me. Jesu 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 sithen 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 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 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 came together as thunder, and Sir Gawaine brake his spear upon Sir Launcelot in a 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 deliverly avoided his horse, and put his shield afore him, and eagerly drew his sword, and bade Sir Launcelot: Alight, traitor knight, for if this mare's son hath failed me, wit thou well a king's son and a queen's son shall not fail thee.

Then Sir Launcelot avoided his horse, and dressed his shield afore him, and drew his sword; and so stood they 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 increase, he then withheld his courage and his wind, and kept himself wonder covert of his might; and under his shield he traced and traversed here and there, to break Sir Gawaine's strokes and his courage; and Sir Gawaine enforced himself with all his might and power to destroy Sir Launcelot; for as the French book saith, 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, that he had right great pain for to defend him.

And when the three hours were passed, that Sir Launcelot felt that Sir Gawaine was come to his own proper strength, then Sir Launcelot said unto Sir Gawaine: Now have I proved you twice, that ye are a full dangerous knight, and a wonderful man of your might; and many wonderful deeds have ye 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 sinked down upon his one side in a swoon. And anon as he did 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 toward 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 Arthur from England that made King Arthur and all his host to remove.

Here followeth the xxi. book.