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Mustard gas was an offensive weapon used on Earth in at least World War I. (PROSE: The Mark of the Rani) Colonel Schott, a veteran of that war, recalled the British use of the gas against the Germans at Ypres. (PROSE: Illegal Alien) The gas was also used in an attack at Verdun, blinding Captain Parkinson. (PROSE: Remembrance of the Daleks) The Eighth Doctor breathed in mustard gas in No Man's Land. (AUDIO: The Great War)