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.
History of Hertfordshire
Hertford Castle was used as a gaol for a series of important captives during the Hundred Years' War. This was actually a series of separate wars that lasted a total of 116 years, between 1337 and 1453. The Plantagenet Kings of England fought the Valois Kings of France, almost entirely on French soil. Queen Isabella was imprisoned by her son, the King, in Hertford Castle in 1330, as were King David II of Scotland and his queen in 1346, after the Battle of Neville's Cross. King John II of France was imprisoned there in 1359 in considerable luxury.