The duke crossed this bridge, accompanied by his brother Richard, and some knights and esquires of his household, followed at a distance by the rest of his attendants, for he never suspected the mischief that was intended him. When he had passed the bridge, one of the count's attendants who counterfeited being a fool, dismounted and threw the planks of the bridge into the water by way of amusement, which prevented the retinue of the duke that had remained behind from crossing it.
The duke, still unsuspecting, laughed heartily at this trick of the fool; but in the mean time, Charles lord of Avaugour, brother to the count, who had lain in ambush with about forty men at arms, sallied out against the duke, who, seeing this, said to the count, 'Fair cousin, what means this? and who are these people?' 'My lord, they are my people, and I arrest you in the name of the dauphin,' at the same time laying hands on him. The duke, greatly surprised, said, 'Ah! fair cousin, you act wickedly; for I came hither at your request, not suspecting you had any evil designs.'
Some of his people, however, drew their swords in his defence; but they soon perceived they were too inferior in numbers to do any good. At the same time, those who had been placed in ambuscade advanced on the duke with drawn swords, when one of the duke's gentlemen, called John de Beaumanoir, had his wrist cut through, and another, named Thibault Buisson was wounded in the hand. One of the count's household, called Henry l'Alemand, wanted to strike the duke with his sword; but the count defended him, and ordered his men to cease fighting, for that he should carry the duke prisoner to the dauphin.
The duke's attendants on the other side of the bridge, seeing the situation of their lord, were much distressed that they could not come to his aid, and knew not how to act. Shortly after, the count de Penthievre, his brother, and his men at arms hastily carried off the duke and his brother Richard toward Poitou, to Bressaire, and thence to Lusignan, to Bournouiau, to Châteaumur, and other places. He was thus a prisoner for six or seven months, without being confined in any prison or treated personally ill; but he was closely watched, and had only one of his domestics to wait on him. His brother Richard was detained a prisoner with him.
You may suppose, that when the knowledge of this arrest of the duke was made known to the duchess and lords of Brittany, they were highly incensed: in particular, the duchess was so grieved that it was with difficulty she could be appeased. The whole of the nobility were speedily assembled, with the duchess, in the town of Nantes, when they solemnly resolved, on oath, to proceed to the deliverance of the duke, and to make war on the count de Penthievre, and on all his friends, allies, and wellwishers. They unanimously chose the lords de Châteaubriant and de Rieux as their commanders, who instantly marched a powerful force against Lamballe, which belonged to the count. It held out for fifteen days, and then surrendered; and the castle and town, which were strongly fortified, were destroyed, and the walls razed. They thence marched to castle Andren, and to la Motte d'Ebron, which were treated in the same manner.
They proceeded to lay siege to Chantoceau, in which was the old countess de Penthievre. The governor was the lord de Bressieres, who defended it well. This siege lasted three months, without much being gained by the besiegers; for it was amply supplied with provision and stores, and well garrisoned by good men at arms.
During this siege, a treaty was made, between the count and the duke, who promised to restore all his places, as well those that had been taken as those that had been demolished, and that he would not, by himself or his friends, any way molest him for what he had done. When this treaty had been concluded, and hostages given for its performance, the count sent back the duke, escorted by the lord de l'Esgle his brother.
The first act of the duke was to raise the siege of Chantoceau; but when the barons of Brittany had again possession of their duke, they refused to comply with the treaty he had made, and insisted that the countess of Penthievre should depart from Chantoceau, and that the place should be put into the hands of the duke.
A day of conference was appointed between the two parties, to see if any terms could be thought of to put an end to these differences; and the count promised to attend in person, giving his brother William as an hostage for his keeping his promise: but he did not appear, having had sure information, that if he did come, he would never return. In truth, had he appeared, he would have been executed judicially, for it had been so determined on by the three estates of the duchy; and they told the duke, that if he meant to keep the treaty made with the count de Penthievre, they would deprive him of the dukedom, and elect his eldest son duke in his stead, so that he was obliged to comply with their wills.
The count de Penthievre, on hearing these things, was much troubled, and not without cause; for he knew that all his landed property and lordships in Brittany were confiscated and in possession of the duke, and that his brother remained as hostage in the hands of the duke, without a possibility of his deliverance.