Regeneration is a 1997 British film, an adaptation of the 1991 novel of the same name by Pat Barker. The film is directed by Gillies MacKinnon. It was released as Behind the Lines in the US in 1998. The film follows the stories of a number of officers of the British Army during World War I who are brought together in Craiglockhart War Hospital where they are treated for various traumas. It features the story of Siegfried Sassoon, his open letter reprinted in The Times criticising the conduct of the war and his return to the front.