In Waterloo Sean stands with historian Professor Saul David where the British and French infantry first clashed at Waterloo. He then travels to Yorkshire in England to explore the role played by cavalry at Waterloo. He meets cavalry experts Alan Larsen and David Blackmore who explain the roles played by light and heavy cavalry units. At the Royal Armouries in Leeds Sean sees examples of original cavalry sword used during the battle and discovers the training manual used to prepare horsemen for battle.