When all had sworn the oath, and given surety, then did they shut fast the portals upon all their food and all the aid they might win against the king and his army who were nigh at hand.
Ere the day darkened came the king himself, in great wrath, and with him many knights who belonged to his household, and many other folk, warlike to behold, and came even to the castle. Then the king demanded of those who were within if they would yield up the burg, and thus save their lives. And they within answered that so long as life remained to them they would not give up the castle, or betray their rightful lord. Then swore the king an oath that an they yielded them not up straight-way they should in no wise escape the uttermost that he might do unto them. But for that they cared little, and made them ready for the defence. They thought to remain upon the battlements, and throw from the castle stones so great and so heavy that the king should be driven from the walls out on to the open field where he had pitched his tents.
With that had the night fallen, and they who had come into the land set up tents and pavilions, and would lodge in the green-wood. When they of within saw that they took counsel together, and said did they leave them in peace that night the king would, doubtless, send for a greater force of knights and other folk, and assemble a mighty army, and it were better that they should now adventure themselves, and ride forth from the castle ere they were yet more outnumbered. Hereof had they bethought them ere yet they came to counsel.
Sir Lancelot spake thus: "Flee we may not, nor dare we hope for aid, nor may we surrender the castle; in this way shall we profit better." Thus were they that night within the castle, neither with game nor with revel, but they held together as true knights and good comrades. They ate and drank of such victuals as they had, and never a man of them wavered as it drew nigh to the dawning; they were fain to do great deeds; each looked to his armour as one who will fight for his life, and gave his steed a feed of corn.
What boots it to make long my tale? With the dawning of the day were they of within ready, each man well armed and mounted on a good steed. They rode out betimes, and bade undo the gates. Thus did they ride forth in all their strength.
They who kept shield-watch without were ware of them, and led their company against them, but it harmed them naught. Morien's weapons were so strong; 'twas he led the vanguard, nor would he yield an inch when he began the strife. Never might one behold mortal man who smote such strokes. They fought their way through that camp. Sir Gawain, Sir Perceval, and Sir Lancelot smote many to death, and came even to the king's tents, and seized their weapons, shields, and spears, ere his folk might come at their arms. They knew not what had befallen them. No quarter would the knights give. They who were with the king slept sound in their ranks, and were sore afeard when they awoke and beheld the armed men who beset them with stern intent; they had many a sore wound ere they fled from the field.
They took the king by main force; there was no man at his side but was glad and blithe might he escape with his life. The king must yield himself a prisoner, thereto did need compel him, otherwise had he been slain and all his folk with him.
They led the king within the castle, and shut him fast in a tower. Never had they so welcome a guest, nor one at whose coming they were so blithe. They on the field must escape as best they might. Little did they reck of all they brought with them; he might win it who had a mind thereto. When the fight was ended King Arthur's men had taken captive much folk and the King of Ireland. Matters had gone well for them. They held there within that which they deemed many would buy dearly, nor count the gold therefor, nor might they well tell how they had lost it. But 'twas their dread of Morien's mighty blows, and of Sir Lancelot, Sir Gawain, and Sir Perceval, who, on the field, had brought many in sore terror and dread of death.
So brought they their guests within the walls, and shut fast their gates, and hung out their shields, as men who might well defend themselves. Then when men beheld Sir Gawain's badge, and Sir Lancelot's pennon beside it, tidings of the combat ran far and wide through the land. The king's folk who lay there were sore vexed thereat. So soon as they who had besieged the queen heard what had chanced they drew off their forces; and all they who served the king, and who came with him into the lands, were greatly shamed, and desired of Sir Gawain in what wise they might make peace.
Sir Gawain took counsel with his comrades, and this was their rede, that they must bring King Arthur there before their eyes ere they might make terms for their lord, the king. "Then shall we have such good counsel on all points that peace may thereby be made."