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  The mayans invented simple and often useless matallic weapons that were not usually sharp or hard.
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  Cannons and Flint locks are first used by the Europeans and would later become a major influence in North America
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  Columbus "discovers" North America and starts an era of trade between the two contenents that exchanged goods and ideas, including weapons.
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  Sébastien de Vauban's socket bayonet is introduced creating entire new strategies for armed warfare.
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  The revolutionary war invented new guerilla warfare tactics that are still used today by out numbered and/or gunned forces
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  The self-contained metal cartridge with a percussion cap in its base was invented by a gunsmith named Houiller in Paris and gainned usage quickly
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  Hiram Maxim demonstrates the first prototype of his machine gun, using the recoil force to eject the spent cartridge and insert a new one.
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  The first German U-boat sets sail. In WW1 shipping would be serverly hindered by U-boat raids.
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  A battleship weapons race is started and is capped off by the HMS Dreadnought
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  The Vickers Fighting Biplane No 1 is unveiled in London at the Olympia Aero Show as the world's first purpose-built fighter plane creating a new front in warfare
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  The first tanks were introduced although they did not catch on until the stalemates of the trench warefare in WW1
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  The Geneva Convention was a set of rules applied to make ware less "violent" by outlawing some of the most vicious types of warfare such as chiemical, gass, and biological warfare.
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  http://www.historyworld.net/timesearch/default.asp?conid=2&bottomsort=21906109&direction=NEXT&keywords=Weapons%20timeline&timelineid=
 German-born US physicist Albert Einstein writes to President Roosevelt, warning of the potential of an atomic bom
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  the German V-2 rocket is successfully tested by Wernher von Braun and his team at Peenemünde
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  Bows and arrows were used
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  Invention of the Flint Bomb by the Mayans. The flint bomb was basically a bright, hot fire