But the most infamous - and deadliest - was mustard gas, in reality an oily vapour first used by the Germans in July 1917, again near Ypres. Known as the “King of Battle Gases”, it acted by ...
A total of 628 military victims were hospitalised with mustard gas symptoms after the sinking of the SS John Harvey, with 83 of them succumbing to their injuries. The number of civilian casualties ...