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 on the defensive, he was eventually forced to take a calculated risk, and move his army further forward to start the battle. This entailed abandoning his chosen position and pulling out, advancing, and then re-installing the long sharpened wooden stakes pointed outwards toward the enemy, which helped protect the longbowmen from cavalry charges. (The use of stakes was an innovation for the English: during the Battle of Crécy, for example, the archers had been instead protected by pits and other obstacles.) The tightness of the terrain also seems to have restricted the planned deployment of the French forces. The French