We may conclude, then, that in deciding on the place for a distant permanent naval base, on which the operations of a whole fleet are to base for war, we should select the best site available, even if military strength and resources may have to be added to it artificially—unless in the case of any site considered the difficulties of adding them are insuperable.
The last sentence may seem like shirking the whole question, because it does not state what "insuperable" means; so it may be well to add that in modern days few engineering difficulties are insuperable, as the existence of the fortress at Heligoland shows. If the submarine and the mine did not exist, the difficulties would be greater than they actually are; because guns alone, no matter how carefully mounted and protected, could hardly be expected to keep off indefinitely the attack of a heavy fleet, or even to save from injury the fighting and auxiliary vessels anchored in its waters. But the submarine and mine combine to keep fighting ships at distances greater than those over which ship's guns can fire, and reduce the amount of fortification required on shore.
One of the principal sources of expense in establishing bases at some points would be that of dredging out harbors sufficiently extensive, while harbors sufficiently extensive are provided already by nature in such localities as Samana. But, as pointed out before, harbors on large islands can be taken from the land side, as was Port Arthur; and adequate protection from land attack is, in many cases, almost impossible if the enemy has command of the sea, as a superior hostile fleet would have in the Caribbean; while the hills and waters of Culebra and Vieques Sound could long defy not only actual invasion, but any fleet attack.
This brings us face to face with the fact that it may be less expensive to establish and protect a naval base situated on a little island, even if an artificial harbor has to be constructed, than to establish and protect a base on a large island, even if the base on the large island has a large natural harbor and can be more easily defended against bombardment from the sea. It would be cheaper, for instance, to protect a base on Culebra than one at Guantanamo, or even Samana, if the enemy commanded the sea; and cheaper to protect a base on the forbidding rocks of Polillo or Guam than on the large and fertile island of Luzon, with its extensive gulfs and bays, in many of which a fleet in command of the sea could land its force; because protecting a base on a large island would require covering a very large area, and perhaps a long extent of coast.
Aircraft may exercise an important influence on the choice of the position of a base, perhaps in the direction of choosing a base on a large island rather than on a small one; since the great speed of aircraft tends to lessen the importance of having the base out a great distance from home—so far as purposes of scouting are concerned. It seems probable also that aircraft will soon be recognized as inherently adapted to preventing the landing of hostile troops, by dropping bombs on the troops, while they are in process of disembarkation, while proceeding in small boats to the shore, and while in the act of landing on the beach, with their guns, ammunition, supplies, horses, and impedimenta of various kinds.
Co-operating Bases.—Discussion of the relative values of positions for bases, say in the Caribbean, should not blind our eyes to the fact, however, that no nation is prevented from establishing as many bases as it needs, wherever its flag may float; that the United States, for instance, is not debarred from establishing permanent naval bases at both Guantanamo and Culebra, should such a procedure seem desirable. The fact that each locality has advantages that the other does not have, suggests the idea that two bases, placed in those localities, would form a powerful combination. In fact, the great value of the position of Culebra being its distance toward the enemy, which necessitates a great distance away from our continental coast, and a long line of communications from that coast suggest an intermediate base as a support and stepping-stone. Analogous cases are seen in all the countries of Europe, in the fortresses that are behind their boundary-lines—the fortresses existing less as individuals than as supporting members of a comprehensive scheme.
Two bases, one at Guantanamo and one at Culebra, would in time of war in the Caribbean, add a value to our fleet that might make the difference between defeat and victory. The effective work that a fleet can do is a function of the material condition of the ships themselves, and of the physical and mental condition of the personnel that man them. Fighting is the most strenuous work that men can do; it calls for the last ounce of strength, the last effort of the intellect, the last struggle of the will; it searches out every physical imperfection in men, in ships, in engines, in joints, in valves. Surprise has sometimes been expressed at the quickness with which the Japanese defeated the Russians at Tsushima; but would any one express surprise if a pugilist, fresh from rest, quickly defeated another pugilist who, exhausted from long travelling, staggered hopelessly into the ring? And how would the betting be before a football match, if it were known that one of the teams would enjoy a rest of twenty-four hours before the game, whereas the other team would walk from the railroad to the ball grounds after a trip across the continent?
These analogies may seem forced—but are they? A living animal requires hours of rest and refreshment, in order that the tissues expended in action may be repaired by the internal mechanism of the body, and the food consumed be supplied from some external source. A fleet is in exactly the same category, even when operating in times of peace: and in time of war it needs, in addition, a station in which injuries may be repaired—a station analogous to that of the hospital for wounded men.
In the Caribbean it would seem necessary to successful operations, therefore, to have two bases, one say at Guantanamo and one at Culebra; the one at Culebra to be the principal base, and the one at Guantanamo the auxiliary. Culebra, by reason of the great work to be accomplished, and the engineering difficulties to be encountered, cannot be gotten ready for several years. Reliance, meanwhile, will have to be placed on Guantanamo; and as the coming of any war is not usually very long foretold, the urgency of fortifying Guantanamo stands out in clear relief.
The mutual relations of Guantanamo and Culebra are much like the mutual relations of Pearl Harbor in Hawaii and Guam—and so are the joint relations of each pair to the mother country. Culebra and Guam are the potential bases of the United States farthest away from the coast in the Atlantic and the Pacific respectively; and the nearest to countries in Europe and Asia with any one of which, of course, war will be always possible, and sometimes probable. Each is a small and rugged island, admitting of tremendous military strengthening by guns, fortifications, mines, and submarines, but connected to the motherland by a long line of communications. The line of communications of Culebra would, of course, be safer than that of Guam, because it is shorter than would be the line of an enemy attacking it; whereas, the line of communications of Guam would be longer. Guantanamo and Pearl Harbor are both stations about half-way from the home country to Culebra and Guam respectively; and though greater danger to our vital and commercial interests exists in the Atlantic than in the Pacific, Pearl Harbor has been fortified, and Guantanamo has not—and neither has Culebra. This sentence is not intended as a criticism of the government for fortifying Pearl Harbor. The Hawaiian Islands occupy the most valuable strategic position in the Pacific, and Pearl Harbor is the most important strategic place in the Hawaiian Islands; and it ought to have been strengthened many years ago, and to a greater degree even than is contemplated now. But the sentence is intended as a protest against our continued inertness in failing to establish any suitable naval bases whatever, especially in the Caribbean.