General Alberto Bayo, often regarded as the architect of Fidel Castro’s military success against the Batista regime, distils his combat experience into a practical guide to guerrilla warfare. Addressing questions such as the ideal size of a guerrilla unit, the training of new recruits, and responses to surprise enemy attacks, the book presents warfare through 150 concise and actionable lessons. A Cuban military commander who fought for the Republican forces during the Spanish Civil War, Bayo offers insights that have made this work a foundational text on insurgency and counter-insurgency.