And as they were thus fighting, the damsel Vivien, lady of the lake, who loved King Arthur, came upon the ground, for she knew by her enchantments how Morgan le Fay had craftily devised to have King Arthur slain by his own sword that day, and therefore came to save his life. And Arthur and Sir Accolon were now grown hot against each other, and spared not strength nor fury in their fierce assaults; but the king's sword gave way continually before Sir Accolon's, so that at every stroke he was sore wounded, and his blood ran from him so fast that it was a marvel he could stand. When King Arthur saw the ground so sore be-blooded, he bethought him in dismay that there was magic treason worked upon him, and that his own true sword was changed, for it seemed to him that the sword in Sir Accolon's hand was Excalibur, for fearfully it drew his blood at every blow, while what he held himself kept no sharp edge, nor fell with any force upon his foe. "Now, knight, look to thyself, and keep thee well from me," cried out Sir Accolon. But King Arthur answered not, and gave him such a buffet on the helm as made him stagger and nigh fall upon the ground. Then Sir Accolon withdrew a little, and came on with Excalibur on high, and smote King Arthur in return with such a mighty stroke as almost felled him; and both being now in hottest wrath, they gave each other grievous and savage blows. But Arthur all the time was losing so much blood that scarcely could he keep upon his feet, yet so full was he of knighthood, that knightly he endured the pain, and still sustained himself, though now he was so feeble that he thought himself about to die. Sir Accolon, as yet, had lost no drop of blood, and being very bold and confident in Excalibur, even grew more vigorous and hasty in his assaults. But all men who beheld them said they never saw a knight fight half so well as did King Arthur, and all the people were so grieved for him that they besought Sir Damas and Sir Outzlake to make up their quarrel and so stay the fight; but they would not.