Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Irregular warfare is warfare in which one or more combatants are irregular military rather than regular forces. Guerrilla warfare is a form of irregular warfare, and so is asymmetric warfare.Irregular warfare favors indirect and asymmetric warfare approaches, though it may employ the full range of military and other capabilities, in order to erode an adversary’s power, influence, and will. It is inherently a protracted struggle that will test the resolve of a nation and its strategic partners. Concepts associated with irregular warfare are not as recent as the irregular warfare term itself.