Question

the special shells the men call \shells on wheels\ are whizzing by continuously. they explode silently and have no smell but can be deadly. they killed several men yesterday. one of my men refused to put his mask on because he couldnt smell anything. all of a sudden, he was dizzy, foaming at the mouth and his skin went black, then he went rigid and died. - paul truffaut, march 5, 1917
in this text, which form of warfare from world war i is truffaut discussing?
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aerial warfare
naval warfare
chemical warfare
conventional warfare

Explanation:

The text mentions "shells on wheels" that explode silently, have no smell but are deadly, and a man refusing to put on a mask (which is relevant for protection against chemical agents). Chemical warfare involves the use of chemical substances (like poisonous gases) as weapons. Aerial warfare is related to air - based attacks, naval warfare is sea - based, and conventional warfare typically uses more traditional weapons like guns and bombs without the specific mention of mask - required, odorless, silent - exploding agents as described here.

Answer:

chemical warfare