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.
Royal Arms of England
In 1340, following the extinction of the House of Capet, Edward III claimed the French throne. In addition to initiating the Hundred Years' War, Edward III expressed his claim in heraldic form by quartering the royal arms of England with the Arms of France. This quartering continued until 1801, with intervals in 1360–1369 and 1420–1422.