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Barbed wire is a type of wire with sharp barbs that can be attached to fences, causing pricks if touched.
LINK: http://www.rushcounty.org/barbedwiremuseum/bwhistory.htm

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Joseph F. Glidden of DeKalb, Illinois, received a patent for the modern invention in 1874 after he made his own modifications to previous versions.

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9) What was the impact and/or effects of your weapon on WWI, a particular battle or on history in general?

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9) What was the impact and/or effects of your weapon on WWI, a particular battle or on history in general?

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Barbed Wire began as only for defense but then later on it became a large part of WW1 because it was used as an intstrument to kill others.

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Barbed wires were usually being used in the Western Front where the Allied and Central Powers fought each other. Almost all the land of the battlefields were covered in barbed wires are was hard to see through them due to the large amounts. There would be areas where fences of barbed wire was only 100 yards apart of the separation of the opposing trenches.
LINK: http://militaryhistorynow.com/2014/01/08/barbed-wire-war-how-one-farmers-innovation-changed-the-battlefield/

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8) How? (How was it used?  How deadly was it?) 

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8) How? (How was it used?  How deadly was it?) 

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It was used by being spread out in a zigzag way running aligned with the ditch. It would keep the enemies out but also trapped.
LINK: http://militaryhistorynow.com/2014/01/08/barbed-wire-war-how-one-farmers-innovation-changed-the-battlefield/
It was very deadly that it was even called "the devils rope."
LINK:
http://gizmodo.com/barbed-wires-dark-deadly-history-1693621916

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Barbed wires were usually used for military defense, mostly to protect the trenches in war. They would keep the enemy out and trapped. However, it was also used as a deadly instrument and led people to their death when shot. Soldiers had great amounts of trouble and risk to get over these deadly fences.
LINK: http://online.wsj.com/ww1/barbed-wire

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The first patent in the United States that used  barbed wire was issued in 1867 to Lucien B. Smith of Kent, Ohio, who is regarded as the inventor. Lucien B. Smith used the barbed wire in the prairies of the Western States, where timber is scarce and fires frequently sweep over them.
LINK: http://www.ohiohistorycentral.org/w/Lucien_B._Smith

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Barbed wire was used because it was crucial to defend the trenches. They  were obstacles used to prevent the enemy raiders from getting to close and to funnel the charging soldiers. This would allow them to be prepared to shoot.
http://militaryhistorynow.com/2014/01/08/barbed-wire-war-how-one-farmers-innovation-changed-the-battlefield/

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Barbed wire was initially used in the the 1800s to pen livestock and later to defend camps during war. During World War 1 it developed into a weapon for when soldiers needed to defend their trenches, but also to create areas where their enemies could be trapped and slaughtered.
LINK:
http://online.wsj.com/ww1/barbed-wire