So Tristram went unto his uncle, who quickly gave him the order of knighthood, and anon sent a messenger unto Sir Marhaus with letters that said he had found a young knight ready to take the battle to the uttermost. Then in all haste King Mark had Sir Tristram horsed and armed in the best manner that might be had or gotten for gold or silver, and he was put into a vessel, both his horse and he, and all that to him belonged both for his body and for his horse, to be taken to an island nigh Sir Marhaus' ships, where it was agreed that they should fight. And when King Mark and his barons beheld young Sir Tristram depart to fight for the right of Cornwall, there was neither man nor woman of honour but wept to see so young a knight jeopard himself for their right. When Sir Tristram was arrived at the island, he commanded his servant Gouvernail to bring his horse to the land and to dress his horse rightly, and then, when he was in the saddle well apparelled and his shield dressed upon his shoulder, he commanded Gouvernail to go to his vessel again and return to King Mark. "And upon thy life," said he, "come thou not nigh this island till thou see me overcome or slain, or else that I win yonder knight." So either departed from other. When Sir Marhaus perceived this young knight seeking to encounter with himself, one of the most renowned knights of the world, he said, "Fair sir, since thou hopest to win honour of me, I let thee wit honour mayest thou none lose by me if thou mayest stand me three strokes, for I let thee wit for my noble deeds, proved and seen, King Arthur made me knight of the Table Round." Then they put spears in rest and ran together so fiercely that they smote either other down, horse and all. Anon they pulled out their swords and lashed together as men that were wild and courageous. Thus they fought more than half a day, and either was wounded passing sore, so that the blood ran down freshly from them upon the ground. By then Sir Tristram waxed more fresh than Sir Marhaus, and better winded, and bigger, and with a mighty stroke he smote Sir Marhaus upon the helm such a buffet, that it went through his helm and through the coif of steel and through the brain-pan, and the sword stuck so fast in the helm and in his brain-pan that Sir Tristram pulled thrice at his sword or ever he might pull it out from his head; and there Marhaus fell down on his knees, the edge of Tristram's sword left in his brain-pan. Suddenly Sir Marhaus rose grovelling, and threw his sword and his shield from him, and so ran to his ships and fled his way, sore groaning. Anon he and his fellowship departed into Ireland, and, as soon as he came to the king his brother, he had his wounds searched, and in his head was found a piece of Sir Tristram's sword. No surgeons might cure this wound, and so he died of Sir Tristram's sword. That piece of the sword the queen his sister kept ever with her, for she thought to be revenged, if she might.