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1 definition by Benito!

When a small irregular force takes on a large regular force through the use of hit and run tactics, the element of surprise, sabotage, destroying the enemies line of communications, etc.
For guerrilla warfare to work, the insurgent army must have the full support of the inhabitants in the area in which the guerrilla forces are trying to liberate. The enemy is also the source of the guerrilla army’s ammunition. Guerrilla is Spanish for "little war" and it originated with the actions of small bands of Spanish soldiers who fought against Napoleon’s French army in the Peninsular War (1807-1814).
by Benito! July 08, 2011