Hundred Years' War (1415–53)
The Lancastrian War was the third and final phase of the Anglo-French Hundred Years' War. It lasted from 1415, when King Henry V of England invaded Normandy, to 1453, when the English lost Bordeaux. It followed a long period of peace from the end of the Caroline War in 1389. The phase was named after the House of Lancaster, the ruling house of the Kingdom of England, to which Henry V belonged.
Joan of Arc
The Hundred Years' War continued for twenty-two years after her death. Charles VII retained legitimacy as the king of France in spite of a rival coronation held for Henry VI at Notre-Dame cathedral in Paris on 16 December 1431, the boy's tenth birthday. Before England could rebuild its military leadership and force of longbowmen lost in 1429, the country lost its alliance with Burgundy when the Treaty of Arras was signed in 1435. The Duke of Bedford died the same year and Henry VI became the youngest king of England to rule without a regent. His weak leadership was probably the most important factor in ending the conflict. Kelly DeVries argues that Joan of Arc's aggressive use of artillery and frontal assaults influenced French tactics for the rest of the war.