So the prisoners, being clad in armour, and having swords by their sides, followed Geoffrey to the hall where the Duke and Huon sat at dinner; and when they had entered the hall, Huon said to his uncle, "Are these the Barons who shall conduct me on my journey?" for he was very desirous to depart. The Duke, thinking that Geoffrey had fulfilled his commandment, said, "Not so, my nephew; these are soldiers whom I have sent for that they may slay you."
When Huon heard this he stood upon his feet, and put his helmet on his head and prepared to fight for his life. Geoffrey, on his part, said to the prisoners, "Show yourselves men, fair sirs, and suffer not a single pagan to escape!" And the prisoners fell on the company that was gathered at dinner with the Duke, and slew them.
As for the Duke, when he saw how he had been deceived, he fled by a secret way that he knew, and, leaping from a window, so escaped. But Geoffrey and the Frenchmen shut to the gates, and drew up the drawbridge, thinking to defend themselves in the castle, for they knew that the Duke would not be content till he had recovered it.
In no long time the Duke, having gathered together a great company of men, laid siege to the castle. He had engines of war with him, and ladders wherewith his men might climb on to the walls and make a breach with pikes and mattocks. And this the pagans did, and for all the valour of Huon and Geoffrey and the prisoners the castle was very like to be taken.
Gerames said to Huon, "Now, sir, it is time for you to blow your horn, for unless there come to us some help we shall scarce see another day." Huon answered, "I would willingly do so, but my horn I have not, for I left it with the Provost."
Meanwhile the Provost had come to the Duke, and said to him, "Sir, this is but ill counsel that you are pulling down your own castle. Make peace with your nephew on this condition, that he and his company straightway depart from out of your city. Let me go, therefore, and persuade him." "You shall go," answered the Duke.
So the Provost, coming to the castle gate, said that he greatly desired to see Huon, who coming, desired to know who he was. When he heard that he was the Provost, he said to him, "Now if you would serve me, give me the horn which I left in your keeping." "That is easily done," answered the Provost, and he drew it from his bosom and gave it to Huon.
Gerames, though he had counselled the blowing of the horn, when he saw Huon now ready to do so, repented, for he mistrusted King Oberon, and would gladly have done without his help. He said, therefore, to Huon, "Sir, I doubt whether you are even now in such a strait that you should blow the horn. Haply King Oberon would not desire that it should be done."
"What mean you?" answered Huon. "Shall I tarry till I am slain before I ask for help?" and putting the horn to his lips he blew it with all his might.
King Oberon heard the blast of the horn where he sat in his city of Mommure, and he said to himself, "Doubtless my friend has need of me; I wish that I were with him and ten thousand men with me." No sooner had he wished it than he and the ten thousand men were in the city of Tormont. A great slaughter did they make of the pagans, but they that were willing to be christened King Oberon saved alive. As for the Duke, he was slain without mercy, for he was an evil man, and had sinned against knowledge, and they hanged his body on a gibbet that was set upon the wall, that his end might serve as an example for others.