Philippine–American War
Filipino strategy

Estimates of the Filipino forces vary between 80,000 and 100,000, with tens of thousands of auxiliaries. Most of the forces were armed only with bolo knives, bows and arrows, spears, and other primitive weapons, which were vastly inferior to the guns and other weapons of the American forces.

A fairly rigid indigenous caste system existed in the Philippines before the Spanish colonial era, which partially survived among the natives during Spanish rule. The goal, or end-state, sought by the First Philippine Republic was a sovereign, independent, stable nation led by an oligarchy composed of members of the educated class (known as the ilustrado class). Local chieftains, landowners, businessmen, and cabezas de barangay were the principales who controlled local politics. The war was at its peak when ilustrados, principales, and peasants were unified in opposition to annexation by the United States. The peasants, who represented the majority of the fighting forces, had interests different from their ilustrado leaders and the principales of their villages. Coupled with the ethnic and geographic fragmentation, aligning the interests of people from different social castes was a daunting task. The challenge for Aguinaldo and his generals was to sustain unified Filipino public opposition; this was the revolutionaries' strategic center of gravity.

The Filipino operational center of gravity was the ability to sustain its force of 100,000 irregulars in the field. The Filipino general Francisco Macabulos described the Filipinos' war aim as, "not to vanquish the U.S. Army but to inflict on them constant losses". In the early stages of the war, the Philippine Revolutionary Army employed the conventional military tactics typical of an organized armed resistance. The hope was to inflict enough American casualties to result in McKinley's defeat by William Jennings Bryan in the 1900 presidential election. They hoped that Bryan, who held strong anti-imperialist views, would withdraw the American forces from the Philippines.

McKinley's election victory in 1900 was demoralizing for the insurgents, and convinced many Filipinos that the United States would not depart quickly. Coupled with a series of devastating losses on the battlefield against American forces equipped with superior technology and training, Aguinaldo became convinced that he needed to change his approach. Beginning on September 14, 1899, Aguinaldo accepted the advice of General Gregorio del Pilar and authorized the use of guerrilla warfare tactics in subsequent military operations in Bulacan.
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