Breton Phase of the Hundred Years' War (1360s)

Timeline

1. 1361–1363Brittany · BrittanyThe 1360 Treaty of Brétigny released the captive Charles of Blois and largely ended the main Anglo-French theater, but the Breton ducal title remained unresolved. The Montfort faction, backed by England, controlled the west and the ports, while the Blois faction relied on the French crown and the Penthièvre family's claims. After 1361 both sides resumed raiding, sieges, and diplomatic maneuvering, and the local war escalated once more.
2. 1364Auray · MorbihanIn 1364 Charles of Blois led French forces and Breton nobles in a counteroffensive against Montfort strongholds. At the Battle of Auray on September 29, the Montfort faction, aided by John IV of Montfort and the renowned English commander John Chandos, routed the Blois army; Charles of Blois was killed and the Blois faction's military prospects collapsed. This battle was the decisive turning point of the Breton War of Succession.
3. 1365Guérande · Loire-AtlantiqueAfter Auray, the Blois faction lost its military core. The 1365 Treaty of Guérande formally recognized John IV of Montfort as Duke of Brittany, while preserving the inheritance rights of Joan of Penthièvre and her heirs to the Penthièvre lands, and stipulated that the duke must swear fealty to the French king. The succession war thus ended; Brittany nominally returned under French sovereignty, the Montfort family gained rule of the duchy, and this local phase of the Hundred Years' War was concluded.