How deadly was the poison gas of WW1?

The total number of British and Empire war deaths caused by gas, according to the Imperial War Museum, was about 6,000 - less than a third of the fatalities suffered by the British on the first day of the Battle of the Somme in 1916. Of the 90,000 soldiers killed by gas on all sides, more than half were Russian, many of whom may not even have been equipped with masks.

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