Mahan on naval warfare

by A. T. Mahan

The second remark bears upon the geographical position of the United States relatively to a Central-American canal. If one be made, and fulfil the hopes of its builders, the Caribbean will be changed from a terminus, and place of local traffic, or at best a broken and imperfect line of travel, as it now is, into one of the great highways of the world. Along this path a great commerce will travel, bringing the interests of the other great nations, the European nations, close along our shores, as they have never been before. With this it will not be so easy as heretofore to stand aloof from international complications. The position of the United States with reference to this route will resemble that of England to the Channel, and of the Mediterranean countries to the Suez route. As regards influence and control over it, depending upon geographical position, it is of course plain that the center of the national power, the permanent base,[^[19]] is much nearer than that of other great nations. The positions now or hereafter occupied by them on island or mainland, however strong, will be but outposts of their power; while in all the raw materials of military strength no nation is superior to the United States. She is, however, weak in a confessed unpreparedness for war; and her geographical nearness to the point of contention loses some of its value by the character of the Gulf coast, which is deficient in ports combining security from an enemy with facility for repairing warships of the first class, without which ships no country can pretend to control any part of the sea. In case of a contest for supremacy in the Caribbean, it seems evident from the depth of the South Pass of the Mississippi, the nearness of New Orleans, and the advantages of the Mississippi Valley for water transit, that the main effort of the country must pour down that valley, and its permanent base of operations be found there. The defense of the entrance to the Mississippi, however, presents peculiar difficulties; while the only two rival ports, Key West and Pensacola, have too little depth of water, and are much less advantageously placed with reference to the resources of the country. To get the full benefit of superior geographical position, these defects must be overcome. Furthermore, as her distance from the Isthmus, though relatively less, is still considerable, the United States will have to obtain in the Caribbean stations fit for contingent, or secondary, bases of operations; which by their natural advantages, susceptibility of defense, and nearness to the central strategic issue, will enable her fleets to remain as near the scene as any opponent. With ingress and egress from the Mississippi sufficiently protected, with such outposts in her hands, and with the communications between them and the home base secured, in short, with proper military preparation, for which she has all necessary means, the preponderance of the United States on this field follows, from her geographical position and her power, with mathematical certainty.

II. Physical Conformation.—The peculiar features of the Gulf coast, alluded to, come properly under the head of Physical Conformation of a country, which is placed second for discussion among the conditions which affect the development of sea power.

The seaboard of a country is one of its frontiers; and the easier the access offered by the frontier to the region beyond, in this case the sea, the greater will be the tendency of a people toward intercourse with the rest of the world by it. If a country be imagined having a long seaboard, but entirely without a harbor, such a country can have no sea trade of its own, no shipping, no navy. This was practically the case with Belgium when it was a Spanish and an Austrian province. The Dutch, in 1648, as a condition of peace after a successful war, exacted that the Scheldt should be closed to sea commerce. This closed the harbor of Antwerp and transferred the sea trade of Belgium to Holland. The Spanish Netherlands ceased to be a sea power.

Numerous and deep harbors are a source of strength and wealth, and doubly so if they are the outlets of navigable streams, which facilitate the concentration in them of a country’s internal trade; but by their very accessibility they become a source of weakness in war, if not properly defended. The Dutch in 1667 found little difficulty in ascending the Thames and burning a large fraction of the English navy within sight of London; whereas a few years later the combined fleets of England and France, when attempting a landing in Holland, were foiled by the difficulties of the coast as much as by the valor of the Dutch fleet. In 1778 the harbor of New York, and with it undisputed control of the Hudson River, would have been lost to the English, who were caught at disadvantage, but for the hesitancy of the French admiral. With that control, New England would have been restored to close and safe communication with New York, New Jersey, and Pennsylvania; and this blow, following so closely on Burgoyne’s disaster of the year before, would probably have led the English to make an earlier peace. The Mississippi is a mighty source of wealth and strength to the United States; but the feeble defenses of its mouth and the number of its subsidiary streams penetrating the country made it a weakness and source of disaster to the Southern Confederacy. And lastly, in 1814, the occupation of the Chesapeake and the destruction of Washington gave a sharp lesson of the dangers incurred through the noblest water-ways, if their approaches be undefended; a lesson recent enough to be easily recalled, but which, from the present appearance of the coast defenses, seems to be yet more easily forgotten. Nor should it be thought that conditions have changed; circumstances and details of offense and defense have been modified, in these days as before, but the great conditions remain the same.

Before and during the great Napoleonic wars, France had no port for ships-of-the-line east of Brest. How great the advantage to England, which in the same stretch has two great arsenals, at Plymouth and at Portsmouth, besides other harbors of refuge and supply. This defect of conformation has since been remedied by the works at Cherbourg.

Besides the contour of the coast, involving easy access to the sea, there are other physical conditions which lead people to the sea or turn them from it. Although France was deficient in military ports on the Channel, she had both there and on the ocean, as well as in the Mediterranean, excellent harbors, favorably situated for trade abroad, and at the outlet of large rivers, which would foster internal traffic. But when Richelieu had put an end to civil war, Frenchmen did not take to the sea with the eagerness and success of the English and Dutch. A principal reason for this has been plausibly found in the physical conditions which have made France a pleasant land, with a delightful climate, producing within itself more than its people needed. England, on the other hand, received from Nature but little, and, until her manufactures were developed, had little to export. Their many wants, combined with their restless activity and other conditions that favored maritime enterprise, led her people abroad; and they there found lands more pleasant and richer than their own. Their needs and genius made them merchants and colonists, then manufacturers and producers; and between products and colonies shipping is the inevitable link. So their sea power grew. But if England was drawn to the sea, Holland was driven to it; without the sea England languished, but Holland died. In the height of her greatness, when she was one of the chief factors in European politics, a competent native authority estimated that the soil of Holland could not support more than one eighth of her inhabitants. The manufactures of the country were then numerous and important, but they had been much later in their growth than the shipping interest. The poverty of the soil and the exposed nature of the coast drove the Dutch first to fishing. Then the discovery of the process of curing the fish gave them material for export as well as home consumption, and so laid the corner-stone of their wealth. Thus they had become traders at the time that the Italian republics, under the pressure of Turkish power and the discovery of the passage round the Cape of Good Hope, were beginning to decline, and they fell heirs to the great Italian trade of the Levant. Further favored by their geographical position, intermediate between the Baltic, France, and the Mediterranean, and at the mouth of the German rivers, they quickly absorbed nearly all the carrying-trade of Europe. The wheat and naval stores of the Baltic, the trade of Spain with her colonies in the New World, the wines of France, and the French coasting-trade were, little more than two hundred years ago, transported in Dutch shipping. Much of the carrying-trade of England, even, was then done in Dutch bottoms. It will not be pretended that all this prosperity proceeded only from the poverty of Holland’s natural resources. Something does not grow from nothing. What is true, is, that by the necessitous condition of her people they were driven to the sea, and were, from their mastery of the shipping business and the size of their fleets, in a position to profit by the sudden expansion of commerce and the spirit of exploration which followed on the discovery of America and of the passage round the Cape. Other causes concurred, but their whole prosperity stood on the sea power to which their poverty gave birth. Their food, their clothing, the raw material for their manufactures, the very timber and hemp with which they built and rigged their ships (and they built nearly as many as all Europe besides), were imported; and when a disastrous war with England in 1653 and 1654 had lasted eighteen months, and their shipping business was stopped, it is said “the sources of revenue which had always maintained the riches of the State, such as fisheries and commerce, were almost dry. Workshops were closed, work was suspended. The Zuyder Zee became a forest of masts; the country was full of beggars; grass grew in the streets, and in Amsterdam fifteen hundred houses were untenanted.” A humiliating peace alone saved them from ruin.

This sorrowful result shows the weakness of a country depending wholly upon sources external to itself for the part it is playing in the world. With large deductions, owing to differences of conditions which need not here be spoken of, the case of Holland then has strong points of resemblance to that of Great Britain now; and they are true prophets, though they seem to be having small honor in their own country, who warn her that the continuance of her prosperity at home depends primarily upon maintaining her power abroad. Men may be discontented at the lack of political privilege; they will be yet more uneasy if they come to lack bread. It is of more interest to Americans to note that the result to France, regarded as a power of the sea, caused by the extent, delightfulness, and richness of the land, has been reproduced in the United States. In the beginning, their forefathers held a narrow strip of land upon the sea, fertile in parts though little developed, abounding in harbors and near rich fishing grounds. These physical conditions combined with an inborn love of the sea, the pulse of that English blood which still beat in their veins, to keep alive all those tendencies and pursuits upon which a healthy sea power depends. Almost every one of the original colonies was on the sea or on one of its great tributaries. All export and import tended toward one coast. Interest in the sea and an intelligent appreciation of the part it played in the public welfare were easily and widely spread; and a motive more influential than care for the public interest was also active, for the abundance of ship-building materials and a relative fewness of other investments made shipping a profitable private interest. How changed the present condition is, all know. The center of power is no longer on the seaboard. Books and newspapers vie with one another in describing the wonderful growth, and the still undeveloped riches, of the interior. Capital there finds its best investments, labor its largest opportunities. The frontiers are neglected and politically weak; the Gulf and Pacific coasts actually so, the Atlantic coast relatively to the central Mississippi Valley. When the day comes that shipping again pays, when the three sea frontiers find that they are not only militarily weak, but poorer for lack of national shipping, their united efforts may avail to lay again the foundations of our sea power. Till then, those who follow the limitations which lack of sea power placed upon the career of France may mourn that their own country is being led, by a like redundancy of home wealth, into the same neglect of that great instrument.

Among modifying physical conditions may be noted a form like that of Italy,—a long peninsula, with a central range of mountains dividing it into two narrow strips, along which the roads connecting the different ports necessarily run. Only an absolute control of the sea can wholly secure such communications, since it is impossible to know at what point an enemy coming from beyond the visible horizon may strike; but still, with an adequate naval force centrally posted, there will be good hope of attacking his fleet, which is at once his base and line of communications, before serious damage has been done. The long, narrow peninsula of Florida, with Key West at its extremity, though flat and thinly populated, presents at first sight conditions like those of Italy. The resemblance may be only superficial, but it seems probable that if the chief scene of a naval war were the Gulf of Mexico, the communications by land to the end of the peninsula might be a matter of consequence, and open to attack.

When the sea not only borders, or surrounds, but also separates a country into two or more parts, the control of it becomes not only desirable, but vitally necessary. Such a physical condition either gives birth and strength to sea power, or makes the country powerless. Such is the condition of the present kingdom of Italy, with its islands of Sardinia and Sicily; and hence in its youth and still existing financial weakness it is seen to put forth such vigorous and intelligent efforts to create a military navy. It has even been argued that, with a navy decidedly superior to her enemy’s, Italy could better base her power upon her islands than upon her mainland; for the insecurity of the lines of communication in the peninsula, already pointed out, would most seriously embarrass an invading army surrounded by a hostile people and threatened from the sea.

The Irish Sea, separating the British Islands, rather resembles an estuary than an actual division; but history has shown the danger from it to the United Kingdom. In the days of Louis XIV, when the French navy nearly equalled the combined English and Dutch, the gravest complications existed in Ireland, which passed almost wholly under the control of the natives and the French. Nevertheless, the Irish Sea was rather a danger to the English—a weak point in their communications—than an advantage to the French. The latter did not venture their ships-of-the-line in its narrow waters, and expeditions intending to land were directed upon the ocean ports in the south and west. At the supreme moment the great French fleet was sent upon the south coast of England, where it decisively defeated the allies, and at the same time twenty-five frigates were sent to St. George’s Channel, against the English communications. In the midst of a hostile people, the English army in Ireland was seriously imperiled, but was saved by the battle of the Boyne and flight of James II. This movement against the enemy’s communications was strictly strategic, and would be as dangerous to England now as in 1690.