Book I - Chapter IX - Of the first war that King Arthur had, and how he won the field.
THEN King Arthur came out of his tower, and had under his gown a jesseraunt of double mail, and there went with him the Archbishop of Canterbury, and Sir Baudwin of Britain, and Sir Kay, and Sir Brastias: these were the men of most worship that were with him. And when they were met there was no meekness, but stout words on both sides; but always King Arthur answered them, and said he would make them to bow an he lived. Wherefore they departed with wrath, and King Arthur bade keep them well, and they bade the king keep him well. So the king returned him to the tower again and armed him and all his knights. What will ye do? said Merlin to the kings; ye were better for to stint, for ye shall not here prevail though ye were ten times so many. Be we well advised to be afeared of a dream-reader? said King Lot. With that Merlin vanished away, and came to King Arthur, and bade him set on them fiercely; and in the meanwhile there were three hundred good men, of the best that were with the kings, that went straight unto King Arthur, and that comforted him greatly. Sir, said Merlin to Arthur, fight not with the sword that ye had by miracle, till that ye see ye go unto the worse, then draw it out and do your best. So forthwithal King Arthur set upon them in their lodging. And Sir Baudwin, Sir Kay, and Sir Brastias slew on the right hand and on the left hand that it was marvel; and always King Arthur on horseback laid on with a sword, and did marvellous deeds of arms, that many of the kings had great joy of his deeds and hardiness.
Then King Lot brake out on the back side, and the King with the Hundred Knights, and King Carados, and set on Arthur fiercely behind him. With that Sir Arthur turned with his knights, and smote behind and before, and ever Sir Arthur was in the foremost press till his horse was slain underneath him. And therewith King Lot smote down King Arthur. With that his four knights received him and set him on horseback. Then he drew his sword Excalibur, but it was so bright in his enemies' eyes, that it gave light like thirty torches. And therewith he put them a-back, and slew much people. And then the commons of Carlion arose with clubs and staves and slew many knights; but all the kings held them together with their knights that were left alive, and so fled and departed. And Merlin came unto Arthur, and counselled him to follow them no further.