Chivalry and Betrayal: The Hundred Years' War
In 1435 Bedford died and sworn enemies Charles VII and Phillip, Duke of Burgundy joined forces to get the English out and with Henry VI reluctance to wage war and to maintain peace by marrying Margaret of Anjou. Charles had no intention of peace and used cannon and sieges to retake France and Normandy culminating in the defeat of the English at the Battle of Castillon in the last English territory of Gascony ending the hundred years war.
Dual monarchy of England and France
The English and French had been constantly at war over hereditary sovereignty in France; the Hundred Years' War (1337–1453) escalated, and the conflict between the two nations reached its peak in an intermittent series of belligerent phases, with each phase usually ending with a temporary truce lasting for a few years. In the first phase Edward III won some extraordinary victories against the French, most notably at Crécy and Sluys. His son Edward, the Black Prince also captured the French king John II at the battle of Poitiers in 1356, and routed the French army. The year 1360 marked the end of the first phase and an opportunity for peace.