BBC NEWS | Science & Environment | Ancient Persians 'gassed Romans'

BBC NEWS | Science & Environment | Ancient Persians 'gassed Romans': "Ancient Persians were the first to use chemical warfare against their enemies, a study has suggested.

A UK researcher said he found evidence that the Persian Empire used poisonous gases on the Roman city of Dura, Eastern Syria, in the 3rd Century AD.

The theory is based on the discovery of remains of about 20 Roman soldiers found at the base of the city wall."