Gas warfare was first introduced during World War I and continued to be used during World War II. It was most commonly used on the front lines and was feared by many. Gas warfare was a very effective warfare tactic. The effects of the gases were unbearable and for this reason they were so feared. Fortunately, by the time World War II broke out, protective masks called gas masks had been invented. This resulted in decreased use in World War II compared to World War I, however did not completely destroy the effort (“Poisonous Gas and World War II”). There were many different purposes for gas warfare during World War I and World War II. , the gases could do anything from simply incapacitate soldiers, to kill hundreds of people at a time. The reasoning behind the gas war was that it was something easy to use, yet highly effective. The French were indeed the first to use gas warfare, but many only know Germany's use as before. The French, however, used gas warfare for the first time in August 1914. The French filled grenades with tear gas and then threw them into the enemy front lines. That said, what was thought to be the first use by the Germans was actually the second. Germany did not actually use gas warfare until the Second Battle of Ypres on April 22, 1915 (“World War I”). Some common information about gas warfare includes: the different types of gas, common symptoms caused by gas, the effects gas has on the environment. human body and the overall effectiveness of the gas. First, some of the different types of gases used were Soman, Chlorine, Mustard Gas, and Phosgene (“Research”). According to Rod Powers, the editor of About.com who received information courtesy of the US Army, some symptoms and the overall effect of the gas...... half of the document...... and Use of gas in World War II. " TheNewsTurmer.com. Np, nd Web. April 20, 2014. "Background and Development of Chemical Weapons." Trans. Hanley. Np, nd Web. Bellis, Mary. "Garrett Morgan - Gas Mask and Traffic Sign." Info. com Inventors. About.com, April 15, 2014. Web. April 20, 2014. Bennett, Jamie "The Last Soldier of Veteran's Drive." Fact Sheets - Tabun - Nerve Agent GA." Chemical Warfare Weapons Fact Sheets - Tabun - Nerve Agent GA. Ed. Rod Powers. U.S. Army, n.d. Web. April 20, 2014."Firstworldwar.com." First World War.com. Ed. Miachael Duffy. Np, nd Web. April 20, 2014. “Chemical Research During World War I.” Two." Poison gases and World War II. Np, nd Web. April 20. 2014.