1917 is a new film directed by Golden Globe winning film maker Sir Sam Mendes. Set in early 1917, at the height of the First World War on the Western Front, Mendes uses the backdrop of the German retreat to the Hindenburg Line as the stage for telling a story inspired by the memories of Alfred Mendes - his grandfather, who served in the Great War. In this interview Dan sits down with Sam Mendes to talk about his familial connection to the movie's plot and the film's attention to historical authenticity.