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 two-to-one". However, Clifford J. Rogers, professor of history at the United States Military Academy at West Point, has recently argued that archival records are too incomplete to substantially change his view that the English were outnumbered about 4–1. Juliet Barker also disagrees with Curry's arguments in the acknowledgements section of her 2005 book on Agincourt, saying: "Surviving administrative records on both sides, but especially the French, are simply too incomplete to support [Curry's] assertion that nine thousand English were pitted against an army only twelve thousand strong. And if the differential really was as low as three to four then