It should likewise be noticed that the same principle of concentration of effort upon the single purpose--the blockade--forbade, _a priori_, any attempts at bombardment by which our armored ships should be brought within range of disablement by heavy guns on shore. If the blockade was our object, rightly or wrongly, and if a blockade, to be secure against serious disturbance, required all the armored ships at our disposal,--as it did,--it follows logically and rigorously that to risk those ships by attacking forts is false to principle, unless special reasons can be adduced sufficiently strong to bring such action within the scope of the principle properly applied. It is here necessary clearly to distinguish. Sound principles in warfare are as useful and as necessary as in morals; when established, the presumption in any case is all on their side, and there is no one of them better established than concentration. But as in morals, so in war, the application of principle, the certainty of right, is not always clear. Could it always be, war would be an exact science; which it is not, but an art, in which true artists are as few as in painting or sculpture. It may be that a bombardment of the fortifications of Havana, or of some other place, might have been expedient, for reasons unknown to the writer; but it is clearly and decisively his opinion that if it would have entailed even a remote risk of serious injury to an armored ship, it stood condemned irretrievably (unless it conduced to getting at the enemy's navy), because it would hazard the maintenance of the blockade, our chosen object, upon which our efforts should be concentrated.[2] There is concentration of purpose, as well as concentration in place, and ex-centric action in either sphere is contrary to sound military principle.
The question of keeping the armored division under Admiral Sampson in the immediate neighborhood of Havana, for the purpose of supporting the blockade by the lighter vessels, was one upon which some diversity of opinion might be expected to arise. Cervera's destination was believed--as it turned out, rightly believed--to be the West Indies. His precise point of arrival was a matter of inference only, as in fact was his general purpose. A natural surmise was that he would go first to Puerto Rico, for reasons previously indicated. But if coal enough remained to him, it was very possible that he might push on at once to his ultimate objective, if that were a Cuban port, thus avoiding the betrayal of his presence at all until within striking distance of his objective. That he could get to the United States coast without first entering a coaling port, whence he would be reported, was antecedently most improbable; and, indeed, it was fair to suppose that, if bound to Havana, coal exigencies would compel him to take a pretty short route, and to pass within scouting range of the Windward Passage, between Cuba and Haïti. Whatever the particular course of reasoning, it was decided that a squadron under Admiral Sampson's command should proceed to the Windward Passage for the purpose of observation, with a view to going further eastward if it should appear advisable. Accordingly, on the 4th of May, five days after Cervera left the Cape de Verde, the Admiral sailed for the appointed position, taking with him all his armored sea-going ships--the _Iowa_, the _Indiana_, and the _New York_--and two monitors, the _Amphitrite_ and the _Terror_. Of course, some smaller cruisers and a collier accompanied him.