And anon the king called upon his knights, squires, and yeomen, and charged them wightly to fetch his noble lords and wise bishops unto him. And when they were come, the king told them his avision, what Sir Gawaine had told him, and warned him that if he fought on the morn he should be slain. Then the king commanded Sir Lucan the Butler, and his brother Sir Bedivere, with two bishops with them, and charged them in any wise, an they might, Take a treaty for a month day with Sir Mordred, and spare not, proffer him lands and goods as much as ye think best. So then they departed, and came to Sir Mordred, where he had a grim host of an hundred thousand men. And there they entreated Sir Mordred long time; and at the last Sir Mordred was agreed for to have Cornwall and Kent, by Arthur’s days: after, all England, after the days of King Arthur.

How by misadventure of an adder the battle began, where Mordred was slain, and Arthur hurt to the death.