A sortie was made by the besieged, led by Henry de Leon, but, being attacked by the whole of the French army, they were driven back into the town, a great many of the citizens being killed.

A warm altercation took place between Henry de Leon and De Montford, who attributed to him the evil result of the sortie.

The result was that a large number of the citizens whose friends had been captured by the French conspired to deliver up the place to Charles of Blois, and Henry de Leon also entered into private negotiations with the Duke of Normandy.

De Montford, finding that he could rely neither upon the citizens nor the soldiers, surrendered to the duke on condition that his life was spared.

He was sent to Paris, where he still remains a prisoner.