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According to James, the Persians, who had heard the Romans tunneling, prepared a nasty surprise." They placed fire pits strategically throughout the tunnel, and when the Romans broke through, the Persians gassed them by adding sulfur crystals and bitumen to the fire. This filled the tunnel with toxic sulfur dioxide gas.
"But James adds vivid new details, based on his careful analysis of the evidence. His real breakthrough is the remarkable fact that the Persian deliberately created a chemical weapon," Mayor told Discovery News.
Make's you wonder how far we really have advanced over some 2000 Years. Same Place, Same Pastime, Same Problems