Sean Bean begins his journey of discovery at Chatham in South East England, where a large group of history enthusiasts are rehearsing to take part in a huge re-enactment of the battle to mark its 200th anniversary in June 2015. Then, he travels to Belgium to visit the site of the battle, where he learns about how the British prepared to face the threat of the French Emperor, Napoleon Bonaparte.

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. 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.