On St Crispin's Day, 25 October 1415, Henry V's small English force routed the French in the most famous clash of the Hundred Years' War. On a battlefield east of the tiny village of Agincourt in northern France, the English king's heavily outnumbered army repelled the massed attacks of the enemy and killed or captured leading members of the French nobility. The encounter changed the course of the war and its impact on English history endures to this day. In this important new study, military historian and battle psychologist Michael K. Jones puts Henry V's inspirational generalship at the heart of the story, showing how the king motivated his tired and hungry soldiers to win against the odds. He also provides a fascinating tour of the Agincourt battlefield, setting out in an accessible way the movements of the opposing armies and offering an exciting new rendition of this heroic triumph of the underdog.