Chemical weapons: A history from Passchendaele to Syria

Mustard gas horrified the world in 1917 - and its deadly legacy continues today

World war 1 soldiers
Austrian soldiers in the trenches in 1917
(Image credit: Getty Images)

Europe fell silent today to honour the centenary of the Battle of Passchendaele, one of the bloodiest battles of World War One and the first in which mustard gas was used effectively as a weapon.

Chemical weapons gained notoriety during the conflict, not only for their lethality but for the manner in which the victims suffered before death.

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