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.
Late Middle Ages
From 1337, England's attention was largely directed towards France in the Hundred Years' War. Henry V's victory at the Battle of Agincourt in 1415 briefly paved the way for a unification of the two kingdoms, but his son Henry VI soon squandered all previous gains. The loss of France led to discontent at home. Soon after the end of the war in 1453, the dynastic struggles of the Wars of the Roses (c. 1455–1485) began, involving the rival dynasties of the House of Lancaster and House of York.