is the first comprehensive comparative analysis of the major World War II guerrilla groups across the Philippine Archipelago, providing a fuller picture of the nature of the war in the Southwest Pacific and revealing the extent to which the guerrilla movement affected operations for both Allied and Imperial Japanese forces. Analyzing the organizational effectiveness of the guerrillas resisting the Japanese occupation of the Philippines, this book alternates narrative chapters with thematic chapters examining the guerrillas’ organization, logistics, administration, intelligence gathering, and the support they received from Allied forces and provided the Allies in turn. Villanueva offers the most in-depth analysis of the guerrillas’ military organization and effectiveness in the context of existing theories of insurgency and counterinsurgency while using an extensive body of memoirs, archival guerrilla and US Army and Navy records, and translations of Japanese documents and interviews with Japanese officers.