I think you can see why...
Wrapped in a fur coat against the chill of the late April evening, the German-Jewish chemist prepared the signal. In front of him were 6,000 metal tanks containing his creation. At six in the evening, the wind was just right to put his plan into action. With his typical Virginian cigar hanging below his trimmed mustache, he gave the signal.
...
The shelling ceased. The valves were opened. 168 tons of chlorine gas was released into the world.
I, luckily, have never been put into battle, but of all recent modern wars, World War I, had to be the worst for the soldiers, followed by The American Civil War.