Chivalry and Betrayal: The Hundred Years' War to confirm his legitimacy resumed the war with France now led by a king who was insane. In 1415 he landed at Harfleur which fell after a long siege weakening the English army. Against advice Henry led his army on a chevauchée to English held Calais but was intercepted by a far larger French army at Agincourt and at the ensuing battle Henry's archers killed the cream of French nobility. At Agincourt Henry V, the son of a usurper, had proved his right to be King and he was determined to regain Normandy and recreate the Duchy and landed in
Battle of Agincourt had originally drawn up a battle plan that had archers and crossbowmen in front of their men-at-arms, with a cavalry force at the rear specifically designed to "fall upon the archers, and use their force to break them," but in the event, the French archers and crossbowmen were deployed "behind" and to the sides of the men-at-arms (where they seem to have played almost no part, except possibly for an initial volley of arrows at the start of the battle). The cavalry force, which could have devastated the English line if it had attacked while they moved their stakes, charged