Horrible Histories author Terry Deary tells the story of the country's biggest and bloodiest ever battle in which 28,000 soldiers died in a single day of slaughter during the Wars of the Roses. Terry unearths objects that tell of the extreme brutality of the Battle of Towton, including bullets, arrowheads and even the skeletons of some of the men who died near Tadcaster in North Yorkshire 550 years ago.