ve. He also is notable for two things: he reformed the
current coin, and recognised the real worth of Du Guesclin, the first
great leader of mercenaries in France, a grim fighting-man, hostile to
the show of feudal warfare, and herald of a new age of contests, in which
the feudal levies would fall into the background. The invention of
gunpowder in this century, the incapacity of the great lords, the rise of
free lances and mercenary troops, all told that a new era had arrived. It
was by the hand of Du Guesclin that Charles overcame his cousin and
namesake, Charles of Navarre, and compelled him to peace. On the other
hand, in the Breton war which followed just after, he was defeated by Sir
John Chandos and the partisans of Jean de Montfort, who made him
prisoner; the Treaty of Guerande, which followed, gave them the dukedom
of Brittany; and Charles V., unable to resist, was fair to receive the
new duke's homage, and to confirm him in the duchy. The King did not
rest till he had ransomed Du Guesclin from the hands of Chandos; he then
gave him commission to raise a paid army of freebooters, the scourge of
France, and to march with them to support, against the Black Prince, the
claims of Henry of Trastamare to the Crown of Castile. Successful at
first by help of the King of Aragon, he was made Constable of Spain at
the coronation of Henry at Burgos. Edward the Black Prince, however,
intervened, and at the battle of Najara (1367) Du Guesclin was again a
prisoner in English hands, and Henry lost his throne. Fever destroyed
the victorious host, and the Black Prince, withdrawing into Gascony,
carried with him the seeds of the disorder which shortened his days. Du
Guesclin soon got his liberty again; and Charles V., seeing how much his
great rival of England was weakened, determined at last on open war. He
allied himself with Henry of Trastamare, listened to the grievances of
the Aquitanians, summoned the Black Prince to appear and answer the
complaints. In 1369, Henry defeated Pedro, took him prisoner, and
murdered him in a brawl; thus perished the hopes of the English party in
the south. About the same time Charles V. sent open defiance and
declaration of war to England. Without delay, he surprised the English
in the north, recovering all Ponthieu at once; the national pride was
aroused; Philip, Duke of Burgundy, who had, through the prudent help of
Charles, lately won as a bride the heiress of Flanders, was stationed at
Rouen,