Guerrilla warfare is a type of unconventional warfare in which small groups of irregular military, such as rebels, partisans, paramilitary personnel or armed civilians use ambushes, sabotage, terrorism, raids, petty warfare or hit-and-run tactics in a rebellion, in a violent conflict, in a war or in a civil war to fight against regular military, police or rival insurgent forces.

Historical Examples include:

• The Vietnam War (1955–1975)
• The Fabian Strategy (217 BC)
• The Boer War (1899–1902)
• The Arab Revolt (1916–1918)
• The Chinese Civil War (1927–1949)
• Afghanistan
• The US-American Indian Wars (1775–1890)

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References

https://en.wikipedia.org/wiki/Guerrilla_warfare