This book is the first study of the mentality of anti-Communist underground fighters and presents, especially, their thinking, ideals, stereotypes and customs. The models and psychological processes that the volume analyses are relevant not only to the Polish partisans, but also to members of other underground organisations, in East-Central Europe, South America and Asia. It explores how the underground organizations were created, who joined them and why, what thoughts and emotions were involved, and what were the consequences of the decisions to join them. Experiences and situations are illustrated with excerpts of diaries and memoirs which reveal the thinking of people in extreme situations, when their lives are in danger, when they are caught in desperate conflicts, or are fighting against overwhelming government forces. The Mentality of Partisans is useful for upper-level undergraduates, postgraduates, and scholars interested in the history of Europe, resistance movements, anticommunism, military and political conflicts, World War Two and non-classical historiography.