Guerrilla warfare in the Philippines—shaped by centuries of resistance tactics against occupational powers—produced surprising yet often underappreciated strength during World War II. Insurgency groups bolstered by Allied support were crucial to Japan's defeat. Although most resistance movements in the Pacific Theater were not largely documented, the offer of US veteran status to Filipino guerrillas allowed the US Army to collect primary evidence through veteran applications. In Philippine Resistance Against Japan in World War II, Robert S. Burrell consults less-referenced archives and other sources to provide historical context on how Philippine resistance became so pervasive and successful, examines US support to the resistance throughout the islands, and fills in the historical record concerning Japan's counterinsurgency efforts.Burrell offers a deep analysis on five distinct Philippine resistance movements during World War II: President Quezon's Own Guerrillas, Luzon Guerrilla Army Forces, Free Panay Guerilla Forces, the Hukbalahap Army, and the Mindanao Guerrilla Resistance Movement. He delineates how centuries of conflict and resistance shaped a unique Philippine resistance ethos, leading to the emergence of hundreds of guerrilla groups from various ethnic and linguistic backgrounds. Burrell also draws parallels between these historical movements and modern strategies, noting how support to resistance movements has rarely been implemented in US war planning.As global conflicts increasingly feature guerilla and insurrectionist tactics, Philippine Resistance Against Japan in World War II lends itself to timely discussions examining strategical and tactical adaptations in the evolving geo-military landscape. Scholars and general readers alike will advance their understanding of resistance methods in warfare and how to counter such tactics when national interests demand it.