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 V marched to the north, the French moved to block them along the River Somme. They were successful for a time, forcing Henry to move south, away from Calais, to find a ford. The English finally crossed the Somme south of Péronne, at Béthencourt and Voyennes and resumed marching north. Without a river obstacle to defend, the French were hesitant to force a battle. They shadowed Henry's army while calling a "semonce des nobles", calling on local nobles to join the army. By 24 October, both armies faced each other for battle, but the French declined, hoping for the arrival