Guerrilla warfare is essentially a political war. Therefore, its area of operations exceeds the territorial limits of conventional warfare, to penetrate the political entity itself: the "political animal" that Aristotle defined. In effect, the human being should be considered the priority objective in a political war. And conceived as the military target of guerrilla war, the human being has his most critical point in his mind. Once his mind has been reached, the "political animal" has been defeated, without necessarily receiving bullets. Guerrilla warfare is born and grows in the political environment; in the constant combat to dominate that area of political mentality that is inherent to all human beings and which collectively constitutes the "environment" in which guerrilla warfare moves, and which is where precisely its victory or failure is defined. This conception of guerrilla warfare as political war turns Psychological Operations into the decisive factor of the results. The target, then, is the minds of the population, all the population: our troops, the enemy troops and the civilian population. This book is a manual for the training of guerrillas in psychological operations, and its application to the concrete case of the Christian and democratic crusade being waged in Nicaragua by the Freedom Commandos. Note: In this text the editor has replaced the phrase Sandinista with "Government" as this manual should be a guide to fight and conquer any oppressive government.