A toxic gas used as a chemical warfare agent in World War I. It caused severe chemical burns and painful blisters on the skin and inside the lungs, as well as eye damage. In the long-term, it led to genetic mutations and cancer among war veterans who were exposed to the gas.
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The timeline below shows where the term Mustard gas appears in The Wars. The colored dots and icons indicate which themes are associated with that appearance.
Part 2, Chapter 3
...the men and causes them to lose their bearings. Robert wonders if it is a mustard gas attack, but Poole tells him that it is probably chlorine emanating naturally from the clay...
(full context)