"He had," says Froissart, "couriers going a-horseback night and day, who, from one day to the next, brought him news from eighty or a hundred leagues' distance, by help of relays posted from town to town." This labor of the king had no success; on the whole the war prosecuted by Charles V.between Edward III.'s death and his own had no result of importance; the attempt, by law and arms, which he made in 1378, to make Brittany his own and reunite it to the crown, completely failed, thanks to the passion with which the Bretons, nobles, burgesses, and peasants, were attached to their country's independence.

Charles V.
actually ran a risk of embroiling himself with the hero of his reign; he had ordered Du Guesclin to reduce to submission the countship of Rennes, his native land, and he showed some temper because the constable not only did not succeed, but advised him to make peace with the Duke of Brittany and his party.

Du Guesclin, grievously hurt, sent to the king his sword of constable, adding that he was about to withdraw to the court of Castile, to Henry of Transtamare, who would show more appreciation of his services.

All Charles V.'s wisdom did not preserve him from one of those deeds of haughty levity which the handling of sovereign power sometimes causes even the wisest kings to commit, but reflection made him promptly acknowledge and retrieve his fault.

He charged the Dukes of Anjou and Bourbon to go and, for his sake, conjure Du Guesclin to remain his constable; and, though some chroniclers declare that Du Guesclin refused, his will, dated the 9th of July, 1380, leads to a contrary belief, for in it he assumes the title of constable of France, and this will preceded the hero's death only by four days.