I understand your scepticism, but, since many soldiers brought their own arms and armor, maybe they brought their own personal vessel (or something) of poison as well. Just a thought, I don't have solid proof or anything.
I've done some research but the only book I found was "Greek Fire, Poison Arrows & Scorpion Bombs: Biological and Chemical Warfare in the Ancient World", that Badass Buddha mentions. If I come across something else I'll post it.
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