Guerrilla troops are unconventional warriors who employ guerrilla warfare, a type of irregular warfare, to defeat their enemy. Guerrilla warfare is characterized by small, mobile groups of irregular fighters who use surprise, ambushes, and raids to attack their enemy and then quickly disappear. Some synonyms for guerrilla troops include insurgents, irregulars, partisans, resistance fighters, rebels, and freedom fighters. These terms all describe groups who fight against established authority. Guerrilla tactics have been used in conflicts around the world, including the American Revolution, the Vietnam War, and the wars in Afghanistan and Iraq. Despite their unconventional methods, guerrilla troops have proven to be formidable opponents in many battles.