The fall of Santiago ended military operations in Cuba, and General Miles, who had come to the front in time to assist General Shafter in arranging the terms of the surrender of Santiago, proceeded at once to Porto Rico. He was rapidly gaining possession of that Island in an almost bloodless campaign when news came of the signing of the peace protocol on August 12. Unfortunately it required longer to convey the information to the Philippines that the war was at an end, and on the day after the signature of the protocol, that is, August 13, General Merritt and Admiral Dewey carried Manila by storm. As early as July 26, 1898, the Spanish government approached President McKinley through M. Cambon, the French ambassador at Washington, and asked for a preliminary statement of the terms on which the war could be brought to a close. After some skirmishing, in which Spain reluctantly yielded to the American ultimatum, a peace protocol was signed on August 12, to the effect that Cuba should be independent, Porto Rico ceded to the United States, and Manila occupied pending the final negotiations, which were opened at Paris by special commissioners on October 1. When the commissioners met according to arrangements, the government of the United States apparently had not come to a conclusion as to the final disposition of the Philippines. The administration was anxious not to go too far in advance of public opinion, at least so far as official pronunciamento was concerned, although powerful commercial interests were busy impressing the public mind with the advantages to be derived from the retention of the distant Pacific Islands. In his instructions to the peace commissioners, on the eve of their departure, Mr. McKinley, while denying that there had originally been any intention of conquest in the Pacific, declared that the march of events had imposed new duties upon us, and added: "Incidental to our tenure in the Philippines is the commercial opportunity to which American statesmanship cannot be indifferent. It is just to use every legitimate means for the enlargement of American trade." While stating that the possession of territory was less important than an "open door" for trade purposes, he concluded by instructing the commissioners that the United States could not "accept less than the cession in full right and sovereignty of the Island of Luzon."