Guerrilla warfare is the unconventional warfare and combat with which a small group of combatants use mobile tactics (ambushes, raids, etc.) to combat a larger and less mobile formal army. The guerrilla army uses ambush (stealth and surprise) and mobility (draw enemy forces to terrain unsuited to them) in attacking vulnerable targets in enemy territory.
This term means "little war" in Spanish and was created during the Peninsular War. The concept acknowledges a conflict between armed civilians against a powerful nation state army. This tactic was used by the Viet Cong and North Vietnam Army in the Vietnam War. Most factions of the Iraqi Insurgency and groups such as FARC are said to be engaged in some form of Guerrilla warfare. - wiki

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