Battle of Agincourt, (October 25, 1415), decisive battle in the Hundred Years’ War (1337–1453) that resulted in the victory of the English over the French. The English army, led by King Henry V, famously achieved victory in spite of the numerical superiority of its opponent. The battle repeated other English successes in the Hundred Years’ War, such as the Battle of Crécy (1346) and the Battle of Poitiers (1356), and made possible England’s subsequent conquest of Normandy and the Treaty of Troyes (1420), which named Henry V heir to the French crown.