Myths? NO!
http://www.theepochtimes.com/n3/1155049-archaeological-evidence-for-1700-year-old-chemical-warfare/
Archaeological Evidence for 1,700-Year-Old Chemical Warfare
By Dhwty, Ancient-Origins.net | December 21, 2014
snippet:
One of the earliest references to the use of chemical weapons in Western literature can be found in the Greek myth of Heracles, in which the hero dips his arrows in the blood of the Hydra to make them toxic. It has also been claimed that poisoned arrows were mentioned by Homer in both his epics, the “Iliad” and the “Odyssey.”