As ships in the harbor sank, men threw themselves into water poisoned by the Harvey’s secret cargo: 2,000 mustard gas bombs. Sailors were drenched in liquid mustard gas, or sulfur mustard, which ...

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 ...