Fully alive to the danger of the situation, the Naval War Board gave orders on the 29th of June for a squadron under Commodore Watson to start for the Spanish coast in hope of drawing Camara back.
The alarm which had previously been created on the American coast by the shrouded approach of Cervera naturally suggested that the Americans themselves might win one of those psychological victories now recognized as such an important factor in modern warfare. The chief purpose of future operations was to convince the Spanish people that they were defeated, and nothing would more conduce to this result than to bring war to their doors. This was, moreover, an operation particularly suited to the conditions under which the United States was waging war, for publicity was here a helping factor. Admiral Sampson, more intent on immediate business than on psychological pressure, was not enthusiastically in favor of the plan. Nevertheless preparation proceeded with that deliberation which in this case was part of the game, and presently the shadow of an impending American attack hung heavy over the coasts of Spain. The Spanish Government at first perhaps considered the order a bluff which the United States would not dare to carry out while Cervera's fleet was so near its own shores; but with the destruction of Cervera's ships the plan became plainly possible, and on the 8th of July the Spanish Government ordered Camara back to parade his vessels before the Spanish cities to assure them of protection.
But, before Camara was called home, the public were watching his advance against the little American fleet at Manila, with an anxiety perhaps greater than Dewey's own. Nothing in modern war equals in dramatic tension the deadly, slow, inevitable approach of a fleet from one side of the world against its enemy on the other. Both beyond the reach of friendly help, each all powerful until it meets its foe, their home countries have to watch the seemingly never coming, but nevertheless certain, clash, which under modern conditions means victory or destruction. It is the highest development of that situation which has been so exploited in a myriad forms by the producers of dramas for the moving pictures and which nightly holds audiences silent; but it plays itself out in war, not in minutes but in months. No one who lived through that period can ever forget the progress of Camara against Dewey, or that of Rozhestvensky with the Russian fleet, six years later, against Togo.
Meanwhile another move was made in the Caribbean. General Miles had from the first considered Porto Rico the best immediate objective: it was much nearer Spain than Cuba, was more nearly self-sufficing if left alone, and less defensible if attacked. The War Department, on the 7th of June, had authorized Miles to assemble thirty thousand troops for the invasion of Porto Rico, and preparations for this expedition were in progress throughout the course of the Santiago campaign. Miles at the time of the surrender of Santiago was actually off that city with reinforcements, which thereupon at once became available as a nucleus to be used against Porto Rico. On the 21st of July he left Guantanamo Bay and, taking the Spaniards as well as the War Department completely by surprise as to his point of attack, he effected a landing on the 26th at Guanica, near the southwestern corner of Porto Rico.
The expeditionary force to Porto Rico, however, consisted not of 30,000 men but of only about 15,000; and it was not fully assembled on the island until the 8th of August. The total Spanish forces amounted to only about 10,000, collected on the defensible ground to the north and in the interior, so that they did not disturb the disembarkation. The American Army which had been dispatched from large Atlantic ports, such as Charleston and Newport News, seems to have been better and more systematically equipped than the troops sent to Santiago. The Americans occupied Guanica, Ponce, and Arroyo with little or no opposition, and were soon in possession of the southern shores of the island.
Between the American forces and the main body of the enemy stretched a range of mountains running east and west through the length of the island. San Juan, the only fortress, which was the main objective of the American Army, lay on the opposite side of this mountain range, on the northern coast of the island. The approach to the fortress lay along a road which crossed the hills and which possessed natural advantages for defense. On the 7th of August a forward movement was begun. While General Wilson's army advanced from Ponce along the main road toward San Juan and General Brooke moved north from Arroyo, General Schwan was to clear the western end of the island and work his way around to Arecibo, toward which General Henry was to advance through the interior. The American armies systematically worked forward, with an occasional skirmish in which they were always victorious, and were received with a warm welcome by the teeming native population. On the 13th of August, General Wilson was on the point of clearing his first mountain range, General Schwan had occupied Mayaguez, and General Henry had passed through the mountains and was marching down the valley of the Arecibo, when orders arrived from Washington to suspend operations.
The center of interest, however, remained in the far-away Philippines. Dewey, who had suddenly burst upon the American people as their first hero, remained a fixed star in their admiration, a position in which his own good judgment and the fortunate scarcity of newspaper correspondents served to maintain him. From him action was expected, and it had been prepared for. Even before news arrived on the 7th of May of Dewey's victory on the 1st of May, the Government had anticipated such a result and had decided to send an army to support him. San Francisco was made a rendezvous for volunteers, and on the 12th of May, General Wesley Merritt was assigned to command the expedition. Dewey reported that he could at any time command the surrender of Manila, but that it would be useless unless he had troops to occupy the city.
On the 19th of May, General Merritt received the following orders: "The destruction of the Spanish fleet at Manila, followed by the taking of the naval station at Cavite, the paroling of the garrisons, and the acquisition of the control of the bay, have rendered it necessary, in the further prosecution of the measures adopted by this Government for the purpose of bringing about an honorable and durable peace with Spain, to send an army of occupation to the Philippines for the twofold purpose of completing the reduction of the Spanish power in that quarter and giving order and security to the islands while in the possession of the United States."
On the 30th of June the first military expedition, after a bloodless capture of the island of Guam, arrived in Manila Bay. A second contingent arrived on the 17th of July, and on the 25th, General Merritt himself with a third force, which brought the number of Americans up to somewhat more than 10,000. The Spaniards had about 13,000 men guarding the rather antiquated fortifications of old Manila and a semicircle of blockhouses and trenches thrown about the city, which contained about 350,000 inhabitants.
It would have been easy to compel surrender or evacuation by the guns of the fleet, had it not been for an additional element in the situation. Manila was already besieged, or rather blockaded, on the land side, by an army of nearly ten thousand Philippine insurgents under their shrewd leader, Emilio Aguinaldo. It does not necessarily follow that those who are fighting the same enemy are fighting together, and in this case the relations between the Americans and the insurgents were far from intimate, though Dewey had kept the situation admirably in hand until the arrival of the American troops.