On November 13, in a conference in Bayambang, Pangasinan, Aguinaldo decided to disperse his army and begin guerrilla war. From that point on, distance and the localistic nature of the fighting prevented him from exercising a strong influence on revolutionary or military operations. Recognizing that American troops blocked his escape east, he turned north and west on November 15, crossing the mountains into La Union province. Aguinaldo's party eluded pursuing American forces, passing through Tirad Pass near Sagada, Mountain Province where the Battle of Tirad Pass was fought on December 2 as a rear guard action to delay the American advance and ensure his escape. At the time of the battle, Aguinaldo and his party were encamped in Cervantes, about 10 km south of the pass. After being notified by a rider of the outcome of the battle and the death of del Pilar, Aguinaldo ordered that camp be broken, and departed with his party for Cayan settlement. Aguinaldo was captured by American forces on March 23, 1901 in Palanan, Isabela. Following his capture, Aguinaldo announced allegiance to the United States on April 1, 1901, formally ending the First Republic and recognizing the sovereignty of the United States over the Philippines.