Gas victims – Templeux-la-Fosse, August 1916 (Gastote). By 1924, people were aware of the horrors of gas but censored wartime reporting spared many from its ghastly details. Here the results are depicted with the raw clarity of someone who was there. Many were probably struck by the appearance of the victims, darkened for lack of oxygen, and the nonchalance of the medical staff. Photograph: Courtesy The Trustees of the British Museum ©DACS 2014