alternatehistory.com

I've been following this thread. It mentions Nazi use of nerve gas in response to Allied nuclear bombings. Tabun was the nerve gas available in the largest quantity. My question is: how lethal was that stuff? Let's say the Germans manage to get together 200 He-111 bombers that manage to drop 400 tonnes of bombs filled with tabun on a British city. How many civilian deaths are we looking at?
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