1547382 French infantrymen during WWI wearing respirators to protect them against German poison gas, from \'The Illustrated War News\', 1915 (b/w photo) by English Photographer, (20th century); Private Collection; (add.info.: French infantrymen during World War One wearing respirators, to protect them against German poison gas, and overalls which are coloured to render the men indistinguishable from the soil of the trenches. From The Illustrated War News, published1915.); English, out of copyright.