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en.wikipedia.org/wiki/Chemical_weapons_in_World_War_I

Although the use of toxic chemicals as weapons dates back thousands of years, the first large ... History of poison gas in World War I[edit]. See also: Weapons of ...

www.historylearningsite.co.uk/world-war-one/the-western-front-in-world-war-one/poison-gas-and-world-war-one

Poison gas was probably the most feared of all weapons in World War One. Poison gas was indiscriminate and could be used on the trenches even when no  ...

www.bbc.com/news/magazine-31042472

Jan 30, 2015 ... Gas terrified soldiers in WW1, but it killed comparatively few of them, at least on the Western Front. So why was it the one WW1 weapon to be ...

www.history.com/this-day-in-history/germans-introduce-poison-gas

At the outbreak of World War I, the Germans began actively to develop chemical weapons. In October 1914, the Germans placed some small tear-gas canisters ...

www.firstworldwar.com/weaponry/gas.htm

British gas mask variant Considered uncivilised prior to World War One, the development and use of poison gas was necessitated by the requirement of wartime ...

science.howstuffworks.com/mustard-gas2.htm

Find out how mustard gas in World War I worked and who used it. ... Germany's first attempt at chemical weapons came in 1915 at the battle of Ypres in Belgium,  ...

chemicalweapons.cenmag.org/when-chemicals-became-weapons-of-war

Feb 27, 2015 ... Even though poison gas was not an efficient killing weapon on WWI battlefields, its adoption set a precedent for using chemicals to murder en ...

www.world-war-1-facts.com/World-War-One-Weapon-Facts/World-War-One-Poison-Gas-Facts.html

World War One poison gas - a list of facts about one of WW1's most horrible weapons.

www.businessinsider.com/the-four-main-poison-gases-used-in-world-war-i-2014-5

May 21, 2014 ... A range of different chemicals were used as weapons throughout WWI. The French were actually the first to utilise them in conflict, when they ...