The reign of Charles V (1364-1380) form the second period of the One Hundred Years old war.
Charles V, known as the Wise one, of weak health, does not make the war in person, but it can organize an army and choose good Generals, who return the victory to France.
The honest Breton knight, Bertrand Du Guesclin, start by beating Charles the Bad one in Cocherel (1364), then it walks to the help of Charles of Blois, besieged in Auray by Jean de Montfort: it cannot prevent it to be beaten and killed, but Jean de Montfort signs the treaty of Guérande, by which it is recognized vassal of the king de France (1365).
At the same time Charles the Bad one reconciles itself with Charles V.
Du Guesclin then takes along to Spain the Large Companies, bands of mercenaries become dangerous since peace, and reverses king de Castille Pierre the Cruel one, but it is beaten in Navarette by Prince Noir, run of Guyenne (1367).
The war starts again between France and England.
Prince Noir ransacks Limoges (1370), but Charles V, adopting a new system of defense, prohibited very great battle; Du Guesclin, named constable, makes to the English a guerrilla warfare and skirmishes, beats them in Pontvalain (1370), and takes again almost all to them their conquests.
In 1375 there remains to them only Calais, Cherbourg, Brest and Guyenne.