Joan moved from land to sea.

She manned several vessels, attacked the French ships she fell in with, ravaged the coasts, and ended by going and placing at the service of the Countess of Montfort her hatred and her son, a boy of seven years of age, whom she had taken with her in all her expeditions, and who was afterwards the great constable, Oliver de Clisson.

We shall find him under Charles V.and Charles VI.

as devoted to France and her kings as if he had not made his first essays in arms against the candidate of their ancestor, Philip.

His mother had sent him to England, to be brought up at the court of Edward III., but, shortly after taking a glorious part with the English in the battle of Auray, in which he lost an eye, and which secured the duchy of Brittany to the Count of Montfort, De Clisson got embroiled none the less with his suzerain, who had given John Chandos the castle of Gavre, near Nantes.