Hundred Years' War English-occupied Calais. In a campaign reminiscent of Crécy, he found himself outmanoeuvred and low on supplies and had to fight a much larger French army at the Battle of Agincourt, north of the Somme. Despite the problems and having a smaller force, his victory was near-total; the French defeat was catastrophic, costing the lives of many of the Armagnac leaders. About 40% of the French nobility was killed. Henry was apparently concerned that the large number of prisoners taken were a security risk (there were more French prisoners than there were soldiers in the entire English army) and he ordered
Battle of Agincourt and various prominent French noblemen of the Armagnac party. This battle is notable for the use of the English longbow in very large numbers, with the English and Welsh archers making up nearly 80 percent of Henry's army. The devastation of the French cavalry at their hands signaled the decline of cavalry and the increasing dominance of ranged weapons on the battlefield. Agincourt is one of England's most celebrated victories and was one of the most important English triumphs in the Hundred Years' War, along with the Battle of Crécy (1346) and Battle of Poitiers (1356). It forms the centrepiece