They worked in brothels frequented by troops serving on the front line in northern France, but their role has been virtually erased from the history books. Thanks to a new Roundhouse art project, Cause and Effect, to mark the centenary of the end of the conflict, the wartime sex workers have been immortalised in a film with poet Hollie McNish. McNish worked with historian Clare Makepeace from Birkbeck, University of London, to create War’s Whores, which details the “significant minority” of men paying for sex on the front line.