Sir Gawaine, seated upon his horse below, laughed grimly, and cried upon the other.
'O Lancelot, Lancelot,' he said, 'what a man of words thou art! If thou darest to battle with me, cease thy babbling, man, and come off, and let us ease our hearts with strong blows.'
Then Sir Lancelot issued forth with many of his knights, and a covenant was made between the hosts that there should be no fighting until Sir Gawaine and Sir Lancelot had fought together, and one was either dead or yielden.
Thereupon the two knights departed some way and then came together with all the might of their horses, and each smote the other in the midst of the shield. So strong were the knights and stout and big the spears, that their horses could not stand the shock, and so fell to the ground. Then the knights quickly avoided their horses and dressed their shields, and fought fiercely together with their swords. So valiantly did each give and receive blows, and so heavy and grim was their fighting, that all the knights and lords that stood thereabout marvelled thereat and were fain to say, in as many good words, that never had they seen such sword-play.
In a little while, so shrewd and skilful were they, both were wounded and the blood oozed from the joints of their armour, and it was great marvel to see that they could still stand, dashing their shields upon each other, and each beating upon the other with great slashes of their swords.
And which was the stronger of the twain none might say.
Now Sir Gawaine had a magic power, which had been endowed upon him at his birth by a great witch who was a friend of his mother, the sorceress, Queen Morgan le Fay, wife of King Lot. No one knew of this secret power except King Arthur, and often had it availed Sir Gawaine, so that in dire perils of onfall, sudden ambush, or long battle, it had given him the victory, when all about him had been slain or wounded or taken captive.
The magic was that, from the hour of nine until high noon, the strength of his body increased until it was three times his natural strength, which itself was full great, though in that, for deep wind and breath and might of arm, Sir Lancelot was the stronger.
Now while they fought together, Sir Lancelot felt that Sir Gawaine seemed not to weaken as time went on, and he marvelled greatly. Then he felt that indeed Sir Gawaine's strength was greater than it had been at the beginning, and a fear came into his heart that Sir Gawaine was possessed of a demon.
But Sir Lancelot was stout of heart as well as old in warcraft, and knew that if he could tire Sir Gawaine he might, by one blow, get the better of him when he saw a good chance. Therefore Sir Lancelot began to husband his strength, and instead of spending it in feinting and attacking, he bore his shield ever before him, covering himself from the fierce blows of his enemy.