Guerrilla warfare has been employed on innumerable occasions throughout history in different circumstances to obtain different objectives. Lately it has been employed in various popular wars of liberation when the vanguard of the people chose the road of irregular armed struggle against enemies of superior military power. Asia, Africa, and Latin America have been the scene of such actions in attempts to obtain power in the struggle against feudal, neo-colonial, or colonial exploitation. In Europe, guerrilla units were used as a supplement to native or allied regular armies.