Germans use Green Cross Phosgene gas as part of last major attempt to take Verdun, attacking with 30,000 men and taking Fort Thiaumont.
— WorldWar1 Day by Day (@WW1TheGreatWar) June 22, 2016
from Twitter https://twitter.com/WW1TheGreatWar
June 22, 2016 at 09:05AM
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