Their conference over, by the advice of Lancelot the knights put themselves in ambush in a wood as near Carlisle as they could secretly approach. And there they remained on guard, waiting to learn what the king might do.
Meantime Mordred, though wounded by Lancelot's sword, had managed to mount his horse, and rode in all haste to tell the king of the bloody end of the ambush. On hearing the story, Arthur's mind was divided between anger and pain.
"It grieves me sorely that Lancelot should be against me," he said; "and much I fear that the glorious fellowship of the Round Table is broken, for many of our noblest knights will hold with him. But dishonor must not rest upon England's crown. The queen has played me false, and shall suffer death for her treason to her wifely duty."
For the law was such in those days, that all, of whatever estate or degree, found guilty of treason, should suffer death. And so it was ordained in Queen Guenever's case—since thirteen knights had been slain, and one escaped sore wounded, in defending the king's honor—that she should be taken to the stake, and there be burnt to death as a traitress.
"My lord Arthur," said Gawaine, "let me counsel you not to be over hasty in this severe judgment, for as I take it the guilt of the queen is not proved. That Lancelot was found in the queen's chamber I admit; but he might have come there with no evil purpose. You know how he has been for years her chosen knight, and how much he has done for her. She may have sent for him privily, to avoid scandal, for conference on some innocent subject. What we do for the best often turns to the worst, and I dare affirm that my lady the queen is, and has always been, faithful and true to her lord. As for Lancelot, I doubt me not he will make good what I have said with word and body, against any and all that question or oppose."
"That I believe," said the king. "I know Lancelot's way. But his boldness does not prove the queen's innocence. For her he shall never fight again, for she shall suffer the penalty of the law. And if I can lay my hands on him, he shall die the shameful death he richly merits."
"Then may Christ save me from ever seeing it," said Gawaine.
"Why say you this?" demanded the king, angrily. "You have no cause to love him. Last night he killed your brother Agravaine, and here is Mordred sorely wounded. He also slew two of your sons, Sir Florence and Sir Lovel."
"I know all that. But I gave them warning beforehand of what would happen if they meddled in this affair. They brought this fate on themselves. As for Agravaine, he stirred up this scandalous business, and has got his deserts."
"Say no more," cried the king, in hot indignation. "I am resolved. The honor of Arthur's wife must be above suspicion. She has fallen from chastity and shall die the death. As for you, Gawaine, I bid you arm in your best armor, with your brethren Gareth and Gaheris, and bring her to the fire, that she may there hear her judgment, and receive the death she merits."