Ancient chemical warfare

Can some one give me tips on ancient chemical warfare and how it was used i want it for my TL?
 
It would be reasonably easy for someone to discover that a sulphide (like several ores) mixed with acid gives a foul smelling, toxic gas today known as H2S or hydrogen sulphide.

It could be good for sieges, and so on.
 
Simply burning sulfur works. Problem with all of these "primitive" chemical agents/gasses is that to be more than an irritant they need high concentrations which are difficult to achieve in the open air. Making any chemical agents that would be effective requires at least early 19th century chemistry. Furthermore even for "effective" agents you need both a substantial amount of agent, and an effective way of delivering a high concentration. The first real use of chemical agents, chlorine by the Germans, was with lots of it released from hundreds of compressed gas cylinders when the wind was right.

What this means is that chemical agents in antiquity are really ASB. Making an effective agent not going to happen, and even if it could be made in small batches making enough to actually be useful and a delivery system, not happening
 
There's the old story about troops incapacitated due to eating poisonous honey (made from the flowers of a toxic plant), if you count that...
 
biological warfare was more common though, like throwing infected corpses of animals and humans into besieged city by means of a catapult.
 
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