Fanning gas from a trench. US Army soldiers fanning gas from a trench. Many of the gases used as weapons during World War I (1914-1918) were heavier than air. This meant they sank into the trenches,where they didn't disperse easily due to the poor ventilation | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Library of Congress |
Taille de l’image : | 4724 px × 3683 px |
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