Science: Mars in White Smock

On April 22, 1915 a brisk wind was blowing from the German lines in the Ypres sector toward the trenches held by French and Algerian troops. Shortly after 5 p. m. the Allied soldiers saw a sinister greenish cloud rolling toward them across No Man's Land. Some of them broke and ran; thousands stuck to their posts or fled too late. Soon the trenches were heaped with gasping, choking, dying men. The gas was chlorine, 168 tons of which were released that day from 5,730 cylinders over a four-mile front. There were 15,000 casualties...

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