In 1645, Charles I lost his struggle against parliament during the decisive crash of the English Civil War. Professor Richard Holmes follows the campaign that led to the Battle of Naseby, starting at the king's headquarters in Oxford. On the battlefield itself he is able to touch the past, as metal detectors unearth musket balls buried for more than 350 years. Members of the Sealed Knot Civil War Reconstruction Society demonstrate the lethal power of the musket and the pike.