Book excerpt: First-rate military history, A War of Frontier and Empire retells an often forgotten chapter in America's past, infusing it with commanding contemporary relevance. It has been termed an insurgency, a revolution, a guerrilla war, and a conventional war. As David J. Silbey demonstrates in this taut, compelling history, the 1899 Philippine-American War was in fact all of these. Played out over three distinct conflicts—one fought between the Spanish and the allied United States and Filipino forces; one fought between the United States and the Philippine Army of Liberation; and one fought between occupying American troops and an insurgent alliance of often divided Filipinos—the war marked America's first steps as a global power and produced a wealth of lessons learned and forgotten.