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I believe that poison gas had the greatest impact on the war. For example in WWI, trenches were commonly used among many countries. However the disadvantage of trenches was that you cant take out the enemy unless the dare to step out of their trench. But poisonous  gas made it possible to kill multiple people in trenches. Even when the enemy were not in trenches, poison gas could take out multiple people at a time. Therefore, poison gas was one of the most important inventions in the war, because it caused most of the casualties. So the poison gas had the greatest impact on the war.

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“Something hit me on the head, making a big dent in my helmet and raising a bump on my head. If it hadn’t been for my helmet my head would have been cracked. As it was I was dazed, knocked down and my gas mask knocked off. I got several breathes [sic] of the strong solution right from the shell before it got diluted with much air. If it hadn’t been for the fellow with me I probably wouldn’t be writing this letter because I couldn’t see, my eyes were running water and burning, so was my nose and I could hardly breathe. I gasped, choked and felt the extreme terror of the man who goes under in the water and will clutch at a straw.

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The French were the first to use poison gas in WWI

Some gasses got as deadly as chlorine and phosgene

Germany produced the most gas totaling 68,000 tons. The British and the French came close with 25,000 and 37,000 tons.

Gas was not the only chemical weapon in WWi.

Gas was launched as a liquid

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http://www.bbc.com/news/magazine-31042472

http://www.history.com/this-day-in-history/soldier-recounts-brush-with-poison-gas

http://madefrom.com/history/world-war-one/gas-and-chemical-warfare-facts/