The Pacification of Samar was a counterinsurgency operation initiated by General Adna Chaffee during the Philippine-American War, following the Balangiga massacre. General hostilities had largely ceased following the capture of Emilio Aguinaldo, president of the insurgent Philippine Republic, and his publication of a manifesto on April 10, 1901 acknowledging and accepting U.S. sovereignty throughout the Philippines.
General Vicente Lukban had been the commander, under Aguinaldo, of a guerilla force on the island of Samar and had, when offered the opportunity to surrender, replied that he intended to fight on to the end. In September, in an action that became known as the Balangiga massacre, Lukban's forces assisted by townspeople in a surprise uprising inflicted 54 killed and 18 wounded on a U.S. Army company garrisoning that town. Following this, General Jacob H. Smith was tasked with the pacification of Samar.