Men gathered around an instructor in the art department at Mill Hill Emergency Hospital, The Ridgeway, MIll Hill, Barnet, Greater London

This photograph shows the treatment of Effort Syndrome. Later known as Da Costa's Syndrome, it was described during the American Civil War, having symptoms that limited a patient's capacity for effort. Around 60,000 cases were recorded amongst British forces during the First World War.

Historic England Archive MED01/01/0890