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The Machine gun was first used as a defensive weapon then it was used for offense

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As the war developed machine guns were adapted for use on tanks on broken ground

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one-man portable machine guns were put to some use while each weighing 9-14 kg, although maintaining sufficient ammunition supplies remained a difficulty

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Light machine guns were adopted too for incorporation into aircraft from 1915 onwards

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On the opening day of the offensive the British suffered a record number of single day casualties, 60,000, the great majority lost under withering machine gun fire

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Germans were the ones who demonstrated the value of the machine gun

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The original Machine gun weighed 62 kg

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The British Army Thought that the machine gun was an improper form of warfare

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Germans had 168 tons of chlorine in 5,730 canisters.

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During World War I, the French army was the first to employ gas, using 26 mm grenades filled with tear gas

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Whether air or water cooled, machine guns still jammed frequently, especially in hot conditions or when used by inexperienced operators.

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The earliest military uses of chemicals were tear-inducing irritants rather than fatal or disabling poisons.

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Water cooled machine guns would still overheat relatively quickly (sometimes within two minutes), with the consequence that large supplies of water would need to be on hand in the heat of a battle - and, when these ran out, it was not unknown for a machine gun crew to solve the problem by urinating into the jacket

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German troops fired fragmentation shells filled with a chemical irritant against British positions at Neuve Chapelle, though the concentration achieved was so small that no one noticed it

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Germany used chemical weapons on the eastern front in an attack at Rawka, south of Warsaw. In response, the artillery branch of the Russian army organized a commission to study the delivery of poison gas in shells.

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The first use of chlorine was before January 2, 1915

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The most common way to die was by machine guns or barbed wire.

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The second battle of Ypres, the Germans used chlorine on three separate occasions.

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People tried to transport light machine guns by wheeled carriages or pack animals but were ultimately unsuccessful.

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Austrian forces attack the Italian lines on Monte San Michele with a mix of phosgene and chlorine gas.

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Phosgene was a potent killing agent, deadlier than chlorine.

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The Germans tried to use the chlorine gas on the Russian fort but they were eventually repelled.

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The use of poison gasses in the war was a war crime according to the 1899 Hague Declaration Concerning Asphyxiating Gases and the 1907 Hague Convention on Land Warfare, which prohibited poison or poisoned weapons.

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Maxim, the guy who invented the machine gun, first gave the idea to Britain, but they rejected the idea.

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Chlorine gas was the first killing agent

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The 1914 machine gun, usually positioned on a flat tripod, would require a gun crew of four to six operators.

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Mustard gas was first used in September of 1918 (https://en.wikipedia.org/wiki/Chemical_weapons_in_World_War_I)

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In WWI, people would wear gas masks similar to the picture below to protect them against poison gasses (pg. 244 in our textbook next to New Technology)

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During the war, the Germans with help from other allies manufactured the machine guns so fast that there was a myth created about it. (http://www.firstworldwar.com/weaponry/machineguns.htm)

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Did you know that a WWI Machine gun fired up to 600 rounds/minute?(http://www.firstworldwar.com/weaponry/machineguns.htm)