Читать книгу Lessons of the war with Spain and other articles - Alfred Thayer Mahan - Страница 3

How the Motive of the War gave Direction to its Earlier Movements.—Strategic Value of Puerto Rico.—Considerations on the Size and Qualities of Battleships.—Mutual Relations of Coast Defence and Navy.

It is a common and a true remark that final judgment cannot be passed upon events still recent. Not only is time required for the mere process of collecting data, of assorting and testing the numerous statements, always imperfect and often conflicting, which form the material for history, but a certain and not very short interval must be permitted to elapse during which men's brains and feelings may return to normal conditions, and permit the various incidents which have exalted or depressed them to be seen in their totality, as well as in their true relative importance. There are thus at least two distinct operations essential to that accuracy of judgment to which alone finality can be attributed,—first, the diligent and close study of detail, by which knowledge is completed; and, second, a certain detachment of the mind from the prejudgments and passions engendered by immediate contact, a certain remoteness, corresponding to the idea of physical distance, in virtue of which confusion and distortion of impression disappear, and one is enabled not only to distinguish the decisive outlines of a period, but also to relegate to their true place in the scheme subordinate details which, at the moment of occurrence, had made an exaggerated impression from their very nearness.

It is yet too soon to look for such fulness and justness of treatment in respect to the late hostilities with Spain. Mere literal truth of narrative cannot yet be attained, even in the always limited degree to which historical truth is gradually elicited from a mass of partial and often irreconcilable testimony; and literal truth, when presented, needs to be accompanied by a discriminating analysis and estimate of the influence exerted upon the general result by individual occurrences, positive or negative. I say positive or negative, for we are too apt to overlook the vast importance of negative factors, of inaction as compared to action, of things not done in comparison with those that were done, of mistakes of omission as contrasted with those of commission. Too frequently men, spectators or actors in careers essentially of action, imagine that a safe course is being held because things continue seemingly as they were; whereas, at least in war, failure to dare greatly is often to run the greatest of risks. "Admiral Hotham," wrote Nelson in 1795, "is perfectly satisfied that each month passes without any losses on our side." The result of this purely negative conduct, of this military sin of mere omission, was that Bonaparte's great Italian campaign of 1796 became possible, that the British Fleet was forced to quit the Mediterranean, and the map of Europe was changed. It is, of course, a commonplace that things never really remain as they were; that they are always getting better or worse, at least relatively.

But while it is true that men must perforce be content to wait a while for the full and sure accounts, and for the summing up which shall pass a final judgment upon the importance of events and upon the reputations of the actors in them, it is also true that in the drive of life, and for the practical guidance of life, which, like time and tide, waits for no man, a rapid, and therefore rough, but still a working decision must be formed from the new experiences, and inferences must be drawn for our governance in the present and the near future, whose exigencies attend us. Absolutely correct conclusions, if ever attained in practical life, are reached by a series of approximations; and it will not do to postpone action until exhaustive certainty has been gained. We have tried it at least once in the navy, watching for a finality of results in the experimental progress of European services. What the condition of our own fleet was at the end of those years might be fresh in all our memories, if we had time to remember. Delayed action maybe eminently proper at one moment; at another it may mean the loss of opportunity. Nor is the process of rapid decision—essential in the field—wholly unsafe in council, if inference and conclusion are checked by reference to well-settled principles and fortified by knowledge of the experience of ages upon whose broad bases those principles rest. Pottering over mechanical details doubtless has its place, but it tends to foster a hesitancy of action which wastes time more valuable than the resultant gain.

The preceding remarks indicate sufficiently the scope of these papers. It is not proposed to give a complete story of the operations, for which the material is not yet available. Neither will it be attempted to pronounce decisions absolutely final, for the time is not yet ripe. The effort will be rather to suggest general directions to thought, which may be useful to a reader as he follows the many narratives, official or personal, given to the public; to draw attention to facts and to analogies; to point out experiences, the lessons from which may be profitable in determining the character of the action that must speedily be taken to place the sea power of the Republic upon a proper material basis; and, finally, to bring the course of this war into relation with the teachings of previous history,—the experiences of the recent past to reinforce or to modify those of the remoter past; for under superficial diversity, due to differences of conditions, there often rests fundamental identity, the recognition of which equips the mind, quickens it, and strengthens it for grappling with the problems of the present and the future. The value of history to us is as a record of human experience; but experiences must be understood.

The character and the direction of the first movements of the United States in this conflict with Spain were determined by the occasion, and by the professed object, of the hostilities. As frequently happens, the latter began before any formal declaration of war had been made; and, as the avowed purpose and cause of our action were not primarily redress for grievances of the United States against Spain, but to enforce the departure of the latter from Cuba, it followed logically that the island became the objective of our military movements, as its deliverance from oppression was the object of the war. Had a more general appreciation of the situation been adopted, a view embracing the undeniable injury to the United States, from the then existing conditions, and the generally iniquitous character of Spanish rule in the colonies, and had war for these reasons been declared, the objective of our operations might have been differently chosen for strategic reasons; for our leading object in such case would not have been to help Cuba, but to constrain Spain, and to compel her to such terms as we might demand. It would have been open, for instance, to urge that Puerto Rico, being between five and six hundred miles from the eastern end of Cuba and nearly double that distance from the two ports of the island most important to Spain,—Havana on the north and Cienfuegos on the south,—would be invaluable to the mother country as an intermediate naval station and as a base of supplies and reinforcements for both her fleet and army; that, if left in her undisturbed possession, it would enable her, practically, to enjoy the same advantage of nearness to the great scene of operations that the United States had in virtue of our geographical situation; and that, therefore, the first objective of the war should be the eastern island, and its reduction the first object. The effect of this would have been to throw Spain back upon her home territory for the support of any operations in Cuba, thus entailing upon her an extremely long line of communications, exposed everywhere throughout its course, but especially to the molestation of small cruisers issuing from the harbors of Puerto Rico, which flank the routes, and which, upon the supposition, would have passed into our hands. This view of the matter was urged upon the writer, a few days before hostilities began, by a very old and intelligent naval officer who had served in our own navy and in that of the Confederate States. To a European nation the argument must have been quite decisive; for to it, as distant, or more distant than Spain from Cuba, such an intermediate station would have been an almost insurmountable obstacle while in an enemy's hands, and an equally valuable base if wrested from him. To the United States these considerations were applicable only in part; for, while the inconvenience to Spain would be the same, the gain to us would be but little, as our lines of communication to Cuba neither required the support of Puerto Rico, nor were by it particularly endangered.

This estimate of the military importance of Puerto Rico should never be lost sight of by us as long as we have any responsibility, direct or indirect, for the safety or independence of Cuba. Puerto Rico, considered militarily, is to Cuba, to the future Isthmian canal, and to our Pacific coast, what Malta is, or may be, to Egypt and the beyond; and there is for us the like necessity to hold and strengthen the one, in its entirety and in its immediate surroundings, that there is for Great Britain to hold the other for the security of her position in Egypt, for her use of the Suez Canal, and for the control of the route to India. It would be extremely difficult for a European state to sustain operations in the eastern Mediterranean with a British fleet at Malta. Similarly, it would be very difficult for a transatlantic state to maintain operations in the western Caribbean with a United States fleet based upon Puerto Rico and the adjacent islands. The same reasons prompted Bonaparte to seize Malta in his expedition against Egypt and India in 1798. In his masterly eyes, as in those of Nelson, it was essential to the communications between France, Egypt, and India. His scheme failed, not because Malta was less than invaluable, but for want of adequate naval strength, without which no maritime position possesses value.

There were, therefore, in America two possible objectives for the United States, in case of a war against Spain waged upon grounds at all general in their nature; but to proceed against either was purely a question of relative naval strength. Unless, and until, the United States fleet available for service in the Caribbean Sea was strong enough to control permanently the waters which separated the Spanish islands from our territory nearest to them, the admitted vast superiority of this country in potential resources for land warfare was completely neutralized. If the Spanish Navy preponderated over ours, it would be evidently impossible for transports carrying troops and supplies to traverse the seas safely; and, unless they could so do, operations of war in the enemy's colonies could neither be begun nor continued. If, again, the two fleets were so equally balanced as to make the question of ultimate preponderance doubtful, it was clearly foolish to land in the islands men whom we might be compelled, by an unlucky sea-fight, to abandon there.

This last condition was that which obtained, as war became imminent. The force of the Spanish Navy—on paper, as the expression goes—was so nearly equal to our own that it was well within the limits of possibility that an unlucky incident—the loss, for example, of a battleship—might make the Spaniard decisively superior in nominal, or even in actual, available force. An excellent authority told the writer that he considered that the loss of the Maine had changed the balance—that is, that whereas with the Maine our fleet had been slightly superior, so after her destruction the advantage, still nominal, was rather the other way. We had, of course, a well-founded confidence in the superior efficiency of our officers and men, and in the probable better condition of our ships and guns; but where so much is at stake as the result of a war, or even as the unnecessary prolongation of war, with its sufferings and anxieties, the only safe rule is to regard the apparent as the actual, until its reality has been tested. However good their information, nations, like fencers, must try their adversary's force before they take liberties. Reconnaissance must precede decisive action. There was, on the part of the Navy Department, no indisposition to take risks, provided success, if obtained, would give an adequate gain. It was clearly recognized that war cannot be made without running risks; but it was also held, unwaveringly, that no merely possible success justified risk, unless it gave a fair promise of diminishing the enemy's naval force, and so of deciding the control of the sea, upon which the issue of the war depended. This single idea, and concentration of purpose upon it, underlay and dictated every step of the Navy Department from first to last,—so far, at least, as the writer knows,—and it must be borne in mind by any reader who wishes to pass intelligent judgment upon the action or non-action of the Department in particular instances.

It was this consideration that brought the Oregon from the Pacific to the Atlantic,—a movement initiated before hostilities opened, though not concluded until after they began. The wisdom of the step was justified not merely, nor chiefly, by the fine part played by that ship on July 3, but by the touch of certainty her presence imparted to the grip of our fleet upon Cervera's squadron during the preceding month, and the consequent power to move the army without fear by sea to Santiago. Few realize the doubts, uncertainties, and difficulties of the sustained watchfulness which attends such operations as the "bottling" of the Spanish fleet by Admiral Sampson; for "bottling" a hostile fleet does not resemble the chance and careless shoving of a cork into a half-used bottle,—it is rather like the wiring down of champagne by bonds that cannot be broken and through which nothing can ooze. This it is which constitutes the claim of the American Commander-in-Chief upon the gratitude of his countrymen; for to his skill and tenacity in conducting that operation is primarily due the early ending of the war, the opportunity to remove our stricken soldiery from a sickly climate, the ending of suspense, and the saving of many lives. "The moment Admiral Cervera's fleet was destroyed," truly said the London "Times" (August 16), "the war was practically at an end, unless Spain had elected to fight on to save the point of honor;" for she could have saved nothing else by continued war.

To such successful operation, however, there is needed not only ships individually powerful, but numbers of such ships; and that the numbers of Sampson's fleet were maintained—not drawn off to other, though important, operations—even under such sore temptation as the dash of Cámara's fleet from Cadiz towards the Philippines, was due to the Department's ability to hold fast the primary conception of concentration upon a single purpose, even though running thereby such a risk as was feared from Cámara's armored ships reaching Dewey's unarmored cruisers before they were reinforced. The chances of the race to Manila, between Cámara, when he started from Cadiz, and the two monitors from San Francisco, were deliberately taken, in order to ensure the retention of Cervera's squadron in Santiago, or its destruction in case of attempted escape. Not till that was sufficiently provided for would Watson's division be allowed to depart. Such exclusive tenacity of purpose, under suspense, is more difficult of maintenance than can be readily recognized by those who have not undergone it. To avoid misconception, it should be added here that our division at the Philippines was not itself endangered, although it was quite possible that Manila Bay might have to be temporarily abandoned if Cámara kept on. The movements of the monitors were well in hand, and their junction assured, even under the control of a commander of less conspicuous ability than that already shown by Admiral Dewey. The return of the united force would speedily have ensured Cámara's destruction and the restoration of previous conditions. It is evident, however, that a certain amount of national mortification, and possibly of political complication, might have occurred in the interim.

The necessity and the difficulty of thus watching the squadrons of an enemy within his ports—of "blockading" them, to use a common expression, of "containing" them, to conform to a strictly accurate military terminology—are more familiar to the British naval mind than to ours; for, both by long historical experience and by present-day needs, the vital importance of so narrowly observing the enemy's movements has been forced upon its consciousness. A committee of very distinguished British admirals a few years since reported that, having in view the difficulty of the operation in itself, and the chances of the force detailed falling below its minimum by accidents, or by absence for coal or refits, British naval supremacy, vital to the Empire, demanded the number of five British battleships to three of the fleet thus to be controlled. Admiral Sampson's armored ships numbered seven to Cervera's four, a proportion not dissimilar; but those seven were all the armored ships, save monitors, worthless for such purpose, that the United States owned, or would own for some months yet to come. It should be instructive and convincing to the American people to note that when two powerful armored ships of the enemy were thus on their way to attack at one end of the world an admiral and a division that had deserved so well of their country, our whole battle-fleet, properly so called, was employed to maintain off Santiago the proportions which foreign officers, writing long before the conditions arose, had fixed as necessary. Yet the state with which we were at war ranks very low among naval Powers.

The circumstance possesses a furthermost practical present interest, from its bearing upon the question between numbers and individual size in the organization of the naval line of battle; for the ever importunate demand for increase in dimensions in the single ship is already upon the United States Navy, and to it no logical, no simply rational, limit has yet been set This question may be stated as follows: A country can, or will, pay only so much for its war fleet. That amount of money means so much aggregate tonnage. How shall that tonnage be allotted? And, especially, how shall the total tonnage invested in armored ships be divided? Will you have a few very big ships, or more numerous medium ships? Where will you strike your mean between numbers and individual size? You cannot have both, unless your purse is unlimited. The Santiago incident, alike in the battle, in the preceding blockade, and in the concurrent necessity of sending battleships to Dewey, illustrates various phases of the argument in favor of numbers as against extremes of individual size. Heavier ships were not needed; fewer ships might have allowed some enemy to escape; when Cervera came out, the Massachusetts was coaling at Guantanamo, and the New York necessarily several miles distant, circumstances which, had the ships been bigger and fewer, would have taken much more, proportionately, from the entire squadron at a critical moment. Above all, had that aggregate, 65,934 of tonnage, in seven ships, been divided among five only, of 13,000 each, I know not how the two ships that were designated to go with Watson to the Philippines could possibly have sailed.

The question is momentous, and claims intelligent and immediate decision; for tonnage once locked up in a built ship cannot be got out and redistributed to meet the call of the moment. Neither may men evade a definite conclusion by saying that they will have both unlimited power—that is, size—and unlimited number; for this they cannot have. A decision must be reached, and upon it purpose must be concentrated unwaveringly; the disadvantages as well as the advantages of the choice must be accepted with singleness of mind. Individual size is needed, for specific reasons; numbers also are necessary. Between the two opposing demands there is doubtless a mean of individual size which will ensure the maximum offensive power of the fleet; for that, and not the maximum power of the single ship, is the true object of battleship construction. Battleships in all ages are meant to act together, in fleets; not singly, as mere cruisers.

A full discussion of all the considerations, on one side or the other, of this question, would demand more space, and more of technical detail, than the scope of these papers permits. As with most conclusions of a concrete character dealing with contradictory elements, the result reached will inevitably be rather an approximation than an absolute demonstrable certainty; a broad general statement, not a narrow formula. All rules of War, which is not an exact science, but an art, have this characteristic. They do not tell one exactly how to do right, but they give warning when a step is being contemplated which the experience of ages asserts to be wrong. To an instructed mind they cry silently, "Despite all plausible arguments, this one element involved in that which you are thinking to do shows that in it you will go wrong." In the judgment of the writer, two conditions must be primarily considered in determining a class of battleship to which, for the sake of homogeneousness, most of the fleet should conform. Of these two, one must be given in general terms; the other can be stated with more precision. The chief requisite to be kept in view in the battleship is the offensive power of the fleet of which it is a member. The aggregate gun-power of the fleet remaining the same, the increase of its numbers, by limiting the size of the individual ships, tends, up to a certain point, to increase its offensive power; for war depends largely upon combination, and facility of combination increases with numbers. Numbers, therefore, mean increase of offensive power, other things remaining equal. I do not quote in defence of this position Nelson's saying, that "numbers only can annihilate," because in his day experience had determined a certain mean size of working battleship, and he probably meant merely that preponderant numbers of that type were necessary; but weight may justly be laid upon the fact that our forerunners had, under the test of experience, accepted a certain working mean, and had rejected those above and below that mean, save for exceptional uses.

The second requisite to be fulfilled in the battleship is known technically as coal endurance,—ability to steam a certain distance without recoaling, allowing in the calculation a reasonable margin of safety, as in all designs. This standard distance should be the greatest that separates two coaling places, as they exist in the scheme of fortified coaling ports which every naval nation should frame for itself. In our own case, such distance is that from Honolulu to Guam, in the Ladrones,—3,500 miles. The excellent results obtained from our vessels already in commission, embodying as they do the tentative experiences of other countries, as well as the reflective powers of our own designers, make it antecedently probable that 10,000 and 12,000 tons represent the extremes of normal displacement advantageous for the United States battleship. When this limit is exceeded, observation of foreign navies goes to show that the numbers of the fleet will be diminished and its aggregate gun-power not increased,—that is, ships of 15,000 tons actually have little more gun-power than those of 10,000. Both results are deviations from the ideal of the battle-fleet already given. In the United States Navy the tendency to huge ships needs to be particularly watched, for we have a tradition in their favor, inherited from the successes of our heavy frigates in the early years of this century. It must be recalled, therefore, that those ships were meant to act singly, but that long experience has shown that for fleet operations a mean of size gives greater aggregate efficiency, both in force and in precision of manœuvre. In the battleship great speed also is distinctly secondary to offensive power and to coal endurance.

To return from a long digression. Either Cuba or Puerto Rico might, in an ordinary case of war, have been selected as the first objective of the United States operations, with very good reasons for either choice. What the British island Santa Lucia is to Jamaica, what Martinique would be to France, engaged in important hostilities in the Caribbean, that, in measure, Puerto Rico is to Cuba, and was to Spain. To this was due the general and justifiable professional expectation that Cervera's squadron would first make for that point, although the anchorage at San Juan, the principal port, leaves very much to be desired in the point of military security for a fleet,—a fact that will call for close and intelligent attention on the part of the professional advisers of the Navy Department. But, while either of the Spanish islands was thus eligible, it would have been quite out of the question to attempt both at the same time, our navy being only equal to the nominal force of Spain; nor, it should be added, could a decided superiority over the latter have justified operations against both, unless our numbers had sufficed to overbear the whole of the hostile war fleet at both points. To have the greater force and then to divide it, so that the enemy can attack either or both fractions with decisively superior numbers, is the acme of military stupidity; nor is it the less stupid because in practice it has been frequently done. In it has often consisted the vaunted operation of "surrounding an enemy," "bringing him between two fires," and so forth; pompous and troublesome combinations by which a divided force, that could perfectly well move as a whole, starts from two or three widely separated points to converge upon a concentrated enemy, permitting him meanwhile the opportunity, if alert enough, to strike the divisions in detail.

Having this obvious consideration in mind, it is curious now to recall that in the "North American Review," so lately as February, 1897, appeared an article entitled, "Can the United States afford to fight Spain?" by "A Foreign Naval Officer,"—evidently, from internal indications, a Spaniard,—in which occurred this brilliant statement: "For the purposes of an attack upon Spain in the West Indies, the American fleet would necessarily divide itself into two squadrons, one ostensibly destined for Puerto Rico, the other for Cuba.... Spain, before attempting to inflict serious damage upon places on the American coast, would certainly try to cut off the connection between the two American squadrons operating in the West Indies, and to attack each separately." The remark illustrates the fool's paradise in which many Spaniards, even naval officers, were living before the war, as is evidenced by articles in their own professional periodicals. To attribute such folly to us was not complimentary; and I own my remarks, upon first reading it, were not complimentary to the writer's professional competency.

All reasons, therefore, combined to direct the first movement of the United States upon Cuba, and upon Cuba alone, leaving Spain in undisputed possession of such advantages as Puerto Rico might give. But Cuba and Puerto Rico, points for attack, were not, unluckily, the only two considerations forced upon the attention of the United States. We have a very long coast-line, and it was notorious that the defences were not so far advanced, judged by modern standards, as to inspire perfect confidence, either in professional men or in the inhabitants. By some of the latter, indeed, were displayed evidences of panic unworthy of men, unmeasured, irreflective, and therefore irrational; due largely, it is to be feared, to that false gospel of peace which preaches it for the physical comfort and ease of mind attendant, and in its argument against war strives to smother righteous indignation or noble ideals by appealing to the fear of loss,—casting the pearls of peace before the swine of self-interest. But a popular outcry, whether well or ill founded, cannot be wholly disregarded by a representative Government; and, outside of the dangers to the coast,—which, in the case of the larger cities at least, were probably exaggerated,—there was certainly an opportunity for an enterprising enemy to embarrass seriously the great coasting trade carried on under our own flag. There was much idle talk, in Spain and elsewhere, about the injury that could be done to United States commerce by scattered cruisers, commerce-destroyers. It was overlooked that our commerce under our own flag is inconsiderable: there were very few American ships abroad to be captured. But the coasting trade, being wholly under our own flag, was, and remains, an extremely vulnerable interest, one the protection of which will make heavy demands upon us in any maritime war. Nor can it be urged that that interest alone will suffer by its own interruption. The bulky cargoes carried by it cannot be transferred to the coastwise railroads without overtaxing the capacities of the latter; all of which means, ultimately, increase of cost and consequent suffering to the consumer, together with serious injury to all related industries dependent upon this traffic.

Under these combined influences the United States Government found itself confronted from the beginning with two objects of military solicitude, widely divergent one from the other, both in geographical position and in method of action; namely, the attack upon Cuba and the protection of its own shores. As the defences did not inspire confidence, the navy had to supplement their weakness, although it is essentially an offensive, and not a defensive, organization. Upon this the enemy counted much at the first. "To defend the Atlantic coasts in case of war," wrote a Spanish lieutenant who had been Naval Attaché in Washington, "the United States will need one squadron to protect the port of New York and another for the Gulf of Mexico. But if the squadron which it now possesses is devoted to the defence of New York (including Long Island Sound), the coasts of the Gulf of Mexico must be entirely abandoned and left at the mercy of blockade and bombardment." Our total force for the order of battle, prior to the arrival of the Oregon, was nominally only equal to that of the enemy, and, when divided between the two objects named, the halves were not decisively superior to the single squadron under Cervera,—which also might be reinforced by some of the armored ships then in Spain. The situation, therefore, was one that is not infrequent, but always embarrassing,—a double purpose and a single force, which, although divisible, ought not to be divided.

It is proper here to say, for the remark is both pertinent and most important, that coast defences and naval force are not interchangeable things; neither are they opponents, one of the other, but complementary. The one is stationary, the other mobile; and, however perfect in itself either may be, the other is necessary to its completeness. In different nations the relative consequence of the two may vary. In Great Britain, whose people are fed, and their raw materials obtained, from the outside world, the need for a fleet vastly exceeds that for coast defences. With us, able to live off ourselves, there is more approach to parity. Men may even differ as to which is the more important; but such difference, in this question, which is purely military, is not according to knowledge. In equal amounts, mobile offensive power is always, and under all conditions, more effective to the ends of war than stationary defensive power. Why, then, provide the latter? Because mobile force, whatever shape it take, ships or men, is limited narrowly as to the weight it can bear; whereas stationary force, generally, being tied to the earth, is restricted in the same direction only by the ability of the designer to cope with the conditions. Given a firm foundation, which practically can always be had, and there is no limit to the amount of armor,—mere defensive outfit,—be it wood, stone, bricks, or iron, that you can erect upon it; neither is there any limit to the weight of guns, the offensive element, that the earth can bear; only they will be motionless guns. The power of a steam navy to move is practically unfettered; its ability to carry weight, whether guns or armor, is comparatively very small. Fortifications, on the contrary, have almost unbounded power to bear weight, whereas their power to move is nil; which again amounts to saying that, being chained, they can put forth offensive power only at arm's length, as it were. Thus stated, it is seen that these two elements of sea warfare are in the strictest sense complementary, one possessing what the other has not; and that the difference is fundamental, essential, unchangeable,—not accidental or temporary. Given local conditions which are generally to be found, greater power, defensive and offensive, can be established in permanent works than can be brought to the spot by fleets. When, therefore, circumstances permit ships to be squarely pitted against fortifications,—not merely to pass swiftly by them,—it is only because the builders of the shore works have not, for some reason, possibly quite adequate, given them the power to repel attack which they might have had. It will not be asserted that there are no exceptions to this, as to most general rules; but as a broad statement it is almost universally true. "I took the liberty to observe," wrote Nelson at the siege of Calvi, when the commanding general suggested that some vessels might batter the forts, "that the business of laying wood against walls was much altered of late." Precisely what was in his mind when he said "of late" does not appear, but the phrase itself shows that the conditions which induced any momentary equality between ships and forts when brought within range were essentially transient.

As seaports, and all entrances from the sea, are stationary, it follows naturally that the arrangements for their defence also should, as a rule, be permanent and stationary, for as such they are strongest. Indeed, unless stationary, they are apt not to be permanent, as was conclusively shown in the late hostilities, where all the new monitors, six in number, intended for coast defence, were diverted from that object and despatched to distant points; two going to Manila, and stripping the Pacific coast of protection, so far as based upon them. This is one of the essential vices of a system of coast defence dependent upon ships, even when constructed for that purpose; they are always liable to be withdrawn by an emergency, real or fancied. Upon the danger of such diversion to the local security, Nelson insisted, when charged with the guard of the Thames in 1801. The block ships (floating batteries), he directed, were on no account to be moved for any momentary advantage; for it might very well be impossible for them to regain their carefully chosen positions when wanted there. Our naval scheme in past years has been seriously damaged, and now suffers, from two misleading conceptions: one that a navy is for defence primarily, and not for offensive war; the other, consequent mainly upon the first, that the monitor, being stronger defensively than offensively, and of inferior mobility, was the best type of warship. The Civil War, being, so far as the sea was concerned, essentially a coast war, naturally fostered this opinion. The monitor in smooth water is better able to stand up to shore guns than ships are which present a larger target; but, for all that, it is more vulnerable, both above water and below, than shore guns are if these are properly distributed. It is a hybrid, neither able to bear the weight that fortifications do, nor having the mobility of ships; and it is, moreover, a poor gun-platform in a sea-way.

There is no saying of Napoleon's known to the writer more pregnant of the whole art and practice of war than this, "Exclusiveness of purpose is the secret of great successes and of great operations." If, therefore, in maritime war, you wish permanent defences for your coasts, rely exclusively upon stationary works, if the conditions admit, not upon floating batteries which have the weaknesses of ships. If you wish offensive war carried on vigorously upon the seas, rely exclusively upon ships that have the qualities of ships and not of floating batteries. We had in the recent hostilities 26,000 tons of shipping sealed up in monitors, of comparatively recent construction, in the Atlantic and the Pacific. There was not an hour from first to last, I will venture to say, that we would not gladly have exchanged the whole six for two battleships of less aggregate displacement; and that although, from the weakness of the Spanish defences, we were able to hug pretty closely most parts of the Cuban coast. Had the Spanish guns at Santiago kept our fleet at a greater distance, we should have lamented still more bitterly the policy which gave us sluggish monitors for mobile battleships.