The working-class Smiths change their initially sunny views on World War I after the three boys of the family witness the harsh reality of trench warfare.
Oh! What a Lovely War is a 1969 British epic comedy historical musical war film directed by Richard Attenborough, with an ensemble cast, including Maggie Smith, Dirk Bogarde, John Gielgud, John Mills, Kenneth More, Laurence Olivier, Jack Hawkins, Corin Redgrave, Michael Redgrave, Vanessa Redgrave, Ralph Richardson, Ian Holm, Paul Shelley, Malcolm McFee, Jean-Pierre Cassel, Nanette Newman, Edward Fox, Susannah York, John Clements, Phyllis Calvert and Maurice Roëves.