Hundred Years' War (1415–53)
By 1449, the French had retaken Rouen. In 1450 the Count of Clermont and Arthur de Richemont, Earl of Richmond, of the Montfort family (the future Arthur III, Duke of Brittany) caught an English army attempting to relieve Caen at the Battle of Formigny and defeated it. The English army was attacked from the flank and rear by Richemont's force just as they were on the verge of beating Clermont's army. The French proceeded to capture Caen on July 6 and Bordeaux and Bayonne in 1451. The attempt by Talbot to retake Guyenne, though initially welcomed by the locals, was crushed by Jean Bureau and his cannons at the Battle of Castillon in 1453 where Talbot had led a small Anglo-Gascon force in a frontal attack on an entrenched camp. This is considered the last battle of the Hundred Years' War.
House of Lancaster
Henry V of England was a successful and ruthless monarch. He was quick to re-assert the claim to the French throne he inherited from Edward III, continuing what was later called the Hundred Years' War. The war was not a formal, continuous conflict but a series of English raids and military expeditions from 1337 until 1453. There were six major royal expeditions; Henry himself led the fifth and sixth, but these were unlike the smaller, frequent, provincial campaigns. In Henry's first major campaignand the fifth major royal campaign of the warhe invaded France, captured Harfleur, made a chevauchée to Calais and won a near-total victory over the French at the Battle of Agincourt despite being outnumbered, outmanoeuvred and low on supplies. In his second campaign, he recaptured much of Normandy and in a treaty secured a marriage to Catherine of Valois. The terms of the Treaty of Troyes were that Henry's and Catherine's heirs would succeed to the throne of France. This condition was contested by the Dauphin and the momentum of the war changed. In 1421, Henry's brother Thomas, Duke of Clarence, was killed at the Battle of Baugé, and Henry V died of dysentery at Vincennes in 1422.