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The longest war ever fought by humans.
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Description: 27 Jan. 2007.
The longest war ever fought by humans was not fought against other humans, but against another species -- Ursus spelaeus, the Cave Bear. For several hundred thousand years our stone age ancestors fought pitched and bloody battles with these denizens of the most precious commodity on earth -- habitable caves. Without these shelters homo sapiens would have had little chance of surviving the Ice Ages, the winter storms, and the myriad of hungry predators that lurked in the dark.
Source & Details: http://www.personal.psu.edu/users/w/x/wxk116/cavebears