The acute, short-term effects of nitrogen mustard—the respiratory complications, the burnt skin, the blisters, the blindness—were so amply monstrous that its long-term effects were overlooked. In 1919, a pair of American pathologists, Edward and Helen Krumbhaar, analyzed the effects of the Ypres bombing on the few men who had survived it. They found that the survivors had an unusual condition of the bone marrow. The normal blood-forming cells had dried up; the bone marrow, in a bizarre mimicry of the scorched and blasted battlefield, was markedly depleted. The men were anemic and needed
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