V0018241 World War I: a poisonous gas attack on the Canadians in Flan Credit: Wellcome Library, London. Wellcome Images images@wellcome.ac.uk http://wellcomeimages.org World War I: a poisonous gas attack on the Canadians in Flanders, 24 April 1915. Coloured chalks by Louis Raemaekers. By: Louis RaemaekersPublished: - Copyrighted work available under Creative Commons Attribution only licence CC BY 4.0 http://creativecommons.org/licenses/by/4.0/
