No sooner did she receive the fatal intelligence, than she assembled the inhabitants of Rennes, where she then resided; and, carrying her infant son in her arms, deplored to them the calamity of their sovereign. She recommended to their care the illustrious orphan, the sole male remaining of their ancient princes, who had governed them with such indulgence and lenity, and to whom they had ever professed the most zealous attachment. She declared herself willing to run all hazards with them in so just a cause; discovered the resources which still remained in the alliance of England; and entreated them to make one effort against an usurper, who, being imposed on them by the arms of France, would in return make a sacrifice to his protector of the ancient liberties of Brittany. The audience, moved by the affecting appearance, and inspirited by the noble conduct of the princess, vowed to live and die with her in defending the rights of her family. All the other fortresses in Brittany embraced the same resolution. The countess went from place to place, encouraging the garrisons, providing them with everything necessary for subsistence, and concerting the proper plans of defence; and after she had put the whole province in a good posture, she shut herself up in Hennebonne, where she waited with impatience the arrival of those succours which Edward had promised her. Meanwhile, she sent over her son to England, that she might both put him in a place of safety, and engage the king more strongly, by such a pledge, to embrace with zeal the interests of her family. Charles of Blois, anxious to make himself master of so important a fortress as Hennebonne, and still more to take the countess prisoner, sat down before it. Frequent sallies were made with success by the garrison; and the countess herself, being the most forward in all military operations, every one was ashamed not to exert himself to the utmost in this desperate situation. One day she perceived that the besiegers, entirely occupied in an attack, had neglected a distant quarter of their camp, and she immediately sallied forth at the head of a body of two hundred cavalry, threw them into confusion, did great execution upon them, and set fire to their tents, baggage, and magazines; but when she was preparing to return, she found that she was intercepted, and that a considerable body of the enemy had thrown themselves between her and the gates. She instantly took her resolution. She ordered her men to disband, and to make the best of their way, by flight, to Brest. She met them at the appointed place of rendezvous, collected another body of five hundred horse, returned to Hennebonne, broke unexpectedly the enemy's camp, and was received with shouts and acclamations by the garrison, who, encouraged by the reinforcement, and by so rare an example of female valour, determined to defend themselves to the last extremity.