The History Squad on MSNOpinion
The first chlorine gas attack of World War One
In 1915, a strange green cloud drifted across the battlefield — and the world witnessed a new kind of horror. Chlorine gas ...
Dr. Martin is an international historian at Harvard University. See more of our coverage in your search results.Encuentra más de nuestra cobertura en los resultados de búsqueda. Add The New York Times ...
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