The Battle of Agincourt was a major English victory in the Hundred Years' War. It took place on 25 October 1415 in the County of Saint-Pol, Artois, some 40 km south of Calais. England's unexpected victory at Agincourt against a numerically superior French army boosted English morale and prestige, crippled France, and started a new period in the war during which the English began enjoying great military successes.