Ancient Chemical Warfare
Chemical warfare has always been one of the most terrifying and unethical methods of murder in history. Around 2,000 years ago, Persian soldiers sieged on the city of Dura by digging tunnels underneath the city to surprise attack them. The Romans caught wind of what they were doing and decided to build some tunnels of their own, only to be blasted with noxious gas that was pumped into their tunnels through a Persian tunnel. Close to 800 skeletons were found with remnants of sulfur and bitumen crystals, suggesting that the Persians used a chemical gas called "the fumes of hell."
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