S1, E3: Henry V claimed the French crown for his heirs, but to secure it, his English troops had to conquer all of France. Potent French resistance came in the most unlikely form. An illiterate young peasant girl, Joan of Arc, led the fight. But she was soon betrayed and executed. And as historian Janina Ramirez reveals, it would take one final, bloody battle to end the Hundred Years' War.