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Pachal, Peter. "TAKEOVER CONTENT HERE." DVICE (Syfy). N.p., 09 Mar. 2007. Web. 10 Jan. 2013.
Smith, Ned. "10 Medieval Weapons That Changed the Face of Warfare." TechNewsDaily.com. N.p., 4 Aug. 2010. Web. 09 Jan. 2013.
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Weir, William. 50 Weapons That Changed Warfare. Franklin Lakes, NJ: New Page, 2005. Print.
Pachal, Peter. "TAKEOVER CONTENT HERE." DVICE (Syfy). N.p., 09 Mar. 2007. Web. 10 Jan. 2013.
Smith, Ned. "10 Medieval Weapons That Changed the Face of Warfare." TechNewsDaily.com. N.p., 4 Aug. 2010. Web. 09 Jan. 2013.
"Top 10 Greatest Military Achievements That Changed the Face of War." Top 10 Lists RSS. N.p., n.d. Web. 09 Jan. 2013.
Weir, William. 50 Weapons That Changed Warfare. Franklin Lakes, NJ: New Page, 2005. Print.