The exiles in Hong Kong organized a Supreme Council, electing del Pilar to a position second only to
Tomás Mascardo. Aguinaldo's confidence in del Pilar grew such that he wrote the following about him: After the Americans defeated the Spanish in the
Battle of Manila Bay, Aguinaldo, del Pilar, and other exiled leaders returned to the Philippines. Aguinaldo named del Pilar Dictator of
Bulacan and
Nueva Ecija provinces, an honor Aguinaldo would not confer to anybody else. On del Pilar's return to the Philippines, he set out to liberating his home province of Bulacan, eventually accepting Spanish surrender on June 24, 1898. Del Pilar was then called to relieve the wounded General Pantaleon García and continue operations in
Caloocan, ultimately succeeded on August 13, 1898. The
Revolutionary Congress was then inaugurated on September 15, 1898, and del Pilar became in charge of the military parade. He was promoted to brigadier general after this event. The Americans were, however, reinforced during the second phase of the Battle and the Filipino forces were forced to retreat. Del Pilar then participated in the
Battle of Calumpit alongside General Luna. Luna, however, had left the battle to punish General
Tomás Mascardo for insubordination, leaving del Pilar with the defense of the Bagbag River. On Luna's return, the Americans had already succeeded in penetrating the Filipino lines and they were forced to retreat. On June 4, 1899, del Pilar joined Aguinaldo in
San Isidro and received orders to capture
Antonio Luna, dead or alive, on charges of high treason. It is said that had Luna not come down himself to
Cabanatuan and assassinated by the Kawit Battalion from his headquarters in
Bayambang that del Pilar would have gone down as Luna's killer. Del Pilar and Aguinaldo then descended upon General Concepcion's headquarters in
Pampanga to relieve him of his position, as he was suspected to be partisan to the assassinated general. Troops surrounded Concepcion's headquarters and sentries were replaced by the presidential guards. Concepción was then relieved of his command on suspicions of a conspiracy being plotted against Aguinaldo. Del Pilar was then tasked with taking possession of Luna's old headquarters in Bayambang, and of liquidating Luna's former aides-de-camp, Manuel and José Bernal. He arrived in Bayambang on June 7 and managed to capture a younger Bernal brother, Angel, who was arrested and maltreated. Manuel Bernal was captured a few days later, located in the house of the Nable José family. Remedios or Dolores, daughters of the family, was said to be one of del Pilar's last loves. Manuel was tortured in the presence of his younger brother Angel by del Pilar and his brother Julian del Pilar for a week before he was killed. José Bernal was captured soon after, taken to
Angeles, Pampanga and murdered by soldiers thereafter. After this, del Pilar was given command in
Pangasinan, where he stayed for five months from June to November 1899. He was also posted in Pangasinan to defend against a possible mutiny from Ilocanos outraged with Luna's assassination, as well as to defend against the
Guardia de Honor, a
millenarian cult fashioned after the
Katipunan. During this time, the American forces were unusually quiet but the revolutionary government failed to capitalize on this opportunity. Del Pilar himself, was engaged in a number of love affairs. In a letter sent to a relative in Bulacan, he asked for the finest of riding boots, while he ordered the best horses in
Dagupan to show off his horsemanship. By November, Tarlac had fallen to the Americans and Aguinaldo was moving northward towards
Bayambang. From Bayambang, the fleeing government led an expedition to
Santa Barbara. Del Pilar, at the time, had 2,000 troops: 1,000 in the del Pilar Brigade, 350 in the Joven column, 400 in the Kawit Battalion, 100 in the Corps of Lancers, and two vanguard companies. del Pilar led the expedition northward towards Ilocos. During this time he carried a briefcase containing a girl's letter and a lock of hair, from one of his loves in Bulacan. ==Tirad Pass and death==