In Feb., 1899, Aguinaldo led a new revolt, this time against U.S. rule. Defeated on the battlefield, the Filipinos turned to guerrilla warfare, and their defeat became a mammoth project for the United States— Thus began the Philippine-American War, one that cost far more money and took far more lives than the Spanish-American War. Fighting broke out on February 4, 1899, after two American privates on patrol killed three Filipino soldiers in San Juan, Metro Manila. Some 126,000 American soldiers would be committed to the conflict; 4,234 American and 16,000 Filipino soldiers, part of a nationwide guerrilla movement of indeterminate numbers, died. Estimates on civilian deaths during the war range between 250,000 and 1,000,000, largely because of famine and disease. Atrocities were committed by both sides.
The poorly equipped Filipino troops were handily overpowered by American troops in open combat, but they were frightening opponents in guerrilla warfare. Malolos, the revolutionary capital, was captured on March 31, 1899. Aguinaldo and his government escaped, however, establishing a new capital at San Isidro, Nueva Ecija. Antonio Luna, Aguinaldo's most capable military commander, was murdered in June. With his best commander dead and his troops suffering continued defeats as American forces pushed into northern Luzon, Aguinaldo dissolved the regular army in November 1899 and ordered the establishment of decentralized guerrilla commands in each of several military zones. The general population, caught between Americans and rebels, suffered significantly.
The revolution was effectively ended with the capture (1901) of Aguinaldo by Gen. Frederick Funston at Palanan, Isabela on March 23, 1901 and was brought to Manila, but the question of Philippine independence remained a burning issue in the politics of both the United States and the islands. The matter was complex by the growing economic ties between the two countries. Although moderately