After an intimation of “no surrender” from the Spaniards, by a cannon-shot fired from the Fort of Santiago towards the approaching United States fleet, the American ships opened fire, to which the Spanish fleet responded with a furious broadside; but being badly directed it did very little damage. The Don Antonio de Ulloa discharged a broadside at the enemyʼs ships with almost no effect, and simultaneously the drums were beaten, whilst the officers and crews shouted “Long live the King, Queen, and Spain!” Firing on both sides then became general. The well-aimed shots of the Americans were beginning to tell forcibly against the Spaniards. The Don Juan de Austria advanced towards the Olympia and was met with a shower of shot and shell, obliging her to turn back. The Reina Cristina, seeing the failure of the Don Juan de Austria, steamed full-speed towards the Olympia, intending to engage her at short range, but a perfect hurricane of projectiles from the Olympia made her retreat with her decks strewn with the dead and dying. The Baltimore had one gun put out of action by the Hontoria guns of Punta Sangley, whilst half a dozen men were slightly injured. The Boston also was slightly damaged, but further than that the American ships suffered little or nothing. By 7.30 a.m. the Spanish flagship Reina Cristina was in flames, so a boat was lowered to transfer the Admiral and his staff to the Isla de Cuba. The captain of the Reina Cristina, Don Luis Cadarso, although mortally wounded, heroically commanded his men up to the moment of death. By 8 a.m. the Spanish ships were decidedly crippled, and the American squadron withdrew to another part of the bay, where, behind a number of foreign war and merchant ships, they had left two supply transports, from which they took fresh ammunition. Meantime the little Spanish gunboats General Lezo, Marqués del Duero, Manila, Velasco, and Argos, which were quite unfit for action, ran ashore at Cavite Viejo. The three shore-batteries of Fort Santiago, the Luneta battlement, and Fort San Antonio Abad (Malate) respectively continued ineffectual firing towards the American fleet until the Commodore sent a message telling them to cease fire or he would shell the city. At 11 a.m. the Americans returned in line of battle, and opened fire on the Spanish ships which still had their flags flying, and cannonaded and silenced the forts at Punta Sangley and Cañacao. These operations lasted about one hour. Of the Spanish ships the Castillo, and Reina Cristina were burnt; the Don Juan de Austria was blown up, and the Don Antonio de Ulloa, pierced all over with shot, sank after the action, and about half of her crew which had survived the battle were drowned. Only the two cruisers Isla de Cuba and Isla de Luzon remained in fighting condition, but the position was so hopeless that Admiral Montojo ordered them to run aground in the Bay of Bacoor.

The Americans then opened fire on the Arsenal and Fort of Cavite, which had not a single gun left in place. Soon a Spanish officer, named Lostoa, signalled for a truce to save the women, children, and wounded. An American officer met him and replied that having destroyed the fleet the American mission was ended for the present, and agreed to suspend firing provided the shore-batteries at the river-mouth were silent. General Augusti was consulted as to this condition, and agreed to it. The mail-steamer Isla de Mindanao was aground off Las Piñas, and being armed as a cruiser the Americans fired on her and she was soon ablaze. There was still another parley with reference to Cavite. The Americans demanded the surrender of the Arsenal, the Admiral, and the surviving crews of the destroyed fleet. As General Peña declined to surrender Cavite, the Americans gave the Spaniards two hours to evacuate, under the threat of bombarding Manila if the demand were not complied with. Again the answer was negative, and five hours were allowed so that General Peña could consult with the Captain-General. General Augusti having authorized the evacuation, in less than two hours Cavite and the whole isthmus, including San Roque, Caridad, Estanzuela, and Dalahican, were under American control. All the Spanish families returned to Manila by land. The next day (May 2) the débriswas cleared away from Cavite and the environs, and the dwellings were cleansed and put in order for indefinite military occupation.

The evacuation of Corregidor Island was demanded by the Americans, and the 100 men composing the garrison were allowed to depart in boats for Naig on the west coast of Cavite. Their commander, however, surrendered himself prisoner, and went on board the Baltimore with his family. He was at once offered (but wisely refused) his liberty, and later on he was put ashore at Balanga (Bataan).

Maj.-General Wesley Merritt

On the Spanish side the losses in men and officers amounted to about 400 killed. It was a decisive victory for the Americans; the entire Spanish fleet in Philippine waters was destroyed, excepting a few small gunboats stationed about the southern islands.[4] After a 15 monthsʼ cruise one of these—the Callao—steamed into Manila Bay on May 12 in complete ignorance of what had happened. The Americans fired a warning shot, and ordered her to lower her flag. With little hesitation she did so, in view of the immensely superior force displayed. The vessel became a prize, and the commander a prisoner of war. But he was shortly offered his liberty on parole, which he unfortunately accepted, for the Spaniards in Manila had so lost their heads that they accused him of cowardice in not having fought the whole American squadron! He was actually court-martialled and condemned to death, but afterwards reprieved.

Admiral George Dewey

The Spaniards exhibited great bravery in the battle of Cavite, and man for man they proved themselves to be in no way inferior to their opponents. Considering the wretched condition of their old-fashioned ships and armament compared with the splendid modern equipment which the Americans brought, no other result could have been expected. The American losses were seven men wounded, none killed, and only slight damage to one vessel.