Osprey's study of gas warfare tactics that were employed during World War I (1914-1918). Battlefield Gas was first employed in April 1915 at the village of Langemarck near Ypres. At 1700 hours the Germans released a five mile-wide cloud of 168 tons of chlorine gas from 520 cylinders, causing panic and death in the French and Algerian trenches. Despite initial widespread condemnation and disgust, its use rapidly spread with all the armies entering...