Hostilities were resumed on April 27, 1898. Prior to that, massive troop preparations were made by the revolutionary forces within the vicinity. General Alvarez wanted to inflict a major assault on the enemies' side. Realizing their vulnerability to the attack coming from the revolutionary forces, the Spanish troops withdrew and regrouped inside
Fort Pilar where they could make their last stand. The Spanish troops and the revolutionary forces continued to exchange fire for three days as the former did not want to surrender. Spanish artillery fire began to slacken its tempo and the revolutionary forces took the advantage of it and ordered the artillery forces to increase the bombardment.
First call for Truce When General Alvarez saw that the Spanish troops could was on the verge of losing the fight, Alvarez called for a truce. Captain Gowito was chosen as head of the truce team. The truce team conveyed the message of Gen. Alvarez that the fort defenders were fighting a losing war and demanded for their surrender. Captain Sebastian said that he would mean an end to the hostilities and free passage to all Spanish forces outside on their way to
Manila. At first, General de los Rios refused the conditions of the truce on grounds that it would involve international protocol. However, he appealed to General Alvarez through Captain Sebastian to allow the civilians and dependent inside the fort to leave Zamboanga under a flag of truce. Alvarez agreed but that no military personnel from the Spanish side would be allowed out of the fort. Thereafter, his men were posted close to the fort to make certain that no one among the Spanish troops would sneak out. The evacuation of the family and dependents of the Spanish troops took several days; some of them who were wounded were boarded. Those who were natives of Zamboanga and preferred to remain were evacuated to the suburbs.
The Siege continues By May 10, the Spanish personnel inside the fort were surprised to see their fortress surrounded on all sides by the force headed by Captain Ramos along the delta and Major Calixto whose men were already posted across from the aqueduct along the beach. At this point in time, the Spanish forces inside the fort prepared themselves for the attack. General Alvarez sent Captain Sebastian to inform General de los Rios that the truce was formally ended and that the attack would follow. General Alvarez knew that both sides were preparing for the eventuality and it was just as matter of time when the fort would fall into his hands. Evidently, the Spanish Governor General wanted General Alvarez to take the initiative, which he did by ordering the guns position behind to fire the first salvo immediately after Captain Sebastian had returned. The exchange of fires between the Spanish troops and revolutionary forces resumed despite the fact that the Spaniards were no longer in a position to make use of the cannons mounted on the breastwork. By the following week of May, there was hardly any of the fort defenders who would post himself on the parapets. More forces from the revolutionary side were arriving to surround the fort and demoralize the Spanish forces. == The surrender of the Fort ==