Hundred Years' War
Historians commonly divide the war into three phases separated by truces: the Edwardian War (1337–1360), the Caroline War (1369–1389), and the Lancastrian War (1415–1453). Local conflicts in neighbouring areas, which were contemporarily related to the war, including the War of the Breton Succession (1341–1365), the Castilian Civil War (1366–1369), the War of the Two Peters (1356–1369) in Aragon, and the 1383–85 crisis in Portugal, were availed by the parties to advance their agendas. Later historians adopted the term "Hundred Years' War" as a historiographical periodisation to encompass all of these events, thus constructing the longest military conflict in European history.
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.