Battle of the Somme: The True Story

On 1 July 1916, The Battle of the Somme became the bloodiest day in the history of the British Empire. Almost 20,000 soldiers lost their lives. Since then, debate has raged over the only combat footage of the battle. Is the footage real or is it fake? Now a team of First World War investigators is trying to do what no one has ever done - use forensic science to solve a 90-year-old mystery trapped on film.