So Sir Gawain rode forth at a swift pace, and with him Gaheris, his brother, for a squire.  And as they went, they saw two knights fighting on horseback, and when they reached them they divided them and asked the reason of their quarrel.  “We fight for a foolish matter,” one replied, “for we be brethren; but there came by a white hart this way, chased by many hounds, and thinking it was an adventure for the high feast of King Arthur, I would have followed it to have gained worship; whereat my younger brother here declared he was the better knight and would go after it instead, and so we fight to prove which of us be the better knight.”

“This is a foolish thing,” said Sir Gawain.  “Fight with all strangers, if ye will, but not brother with brother.  Take my advice, set on against me, and if ye yield to me, as I shall do my best to make ye, ye shall go to King Arthur and yield ye to his grace.”

“Sir knight,” replied the brothers, “we are weary, and will do thy wish without encountering thee; but by whom shall we tell the king that we were sent?”

“By the knight that followeth the quest of the white hart,” said Sir Gawain.  “And now tell me your names, and let us part.”

“Sorlous and Brian of the Forest,” they replied; and so they went their way to the king’s court.

Then Sir Gawain, still following his quest by the distant baying of the hounds, came to a great river, and saw the hart swimming over and near to the further bank.  And as he was about to plunge in and swim after, he saw a knight upon the other side, who cried, “Come not over here, Sir knight, after that hart, save thou wilt joust with me.”

“I will not fail for that,” said Sir Gawain; and swam his horse across the stream.

Anon they got their spears, and ran against each other fiercely; and Sir Gawain smote the stranger off his horse, and turning, bade him yield.

“Nay,” replied he, “not so; for though ye have the better of me on horseback, I pray thee, valiant knight, alight, and let us match together with our swords on foot.”

“What is thy name?” quoth Gawain.

“Allardin of the Isles,” replied the stranger.

Then they fell on each other; but soon Sir Gawain struck him through the helm, so deeply and so hard, that all his brains were scattered, and Sir Allardin fell dead.  “Ah,” said Gaheris, “that was a mighty stroke for a young knight!”

Then did they turn again to follow the white hart, and let slip three couple of greyhounds after him; and at the last they chased him to a castle, and there they overtook and slew him, in the chief courtyard.

At that there rushed a knight forth from a chamber, with a drawn sword in his hand, and slew two of the hounds before their eyes, and chased the others from the castle, crying, “Oh, my white hart! alas, that thou art dead! for thee my sovereign lady gave to me, and evil have I kept thee; but if I live, thy death shall be dear bought.”  Anon he went within and armed, and came out fiercely, and met Sir Gawain face to face.