Preponderance over England, in combination with France, was also the aim of the equally humbled but less vigorous kingdom of Spain; but there was a definiteness in the injuries suffered and the objects specially sought by her which is less easily found in the broader views of her ally. Although no Spaniard then living could remember the Spanish flag flying over Minorca, Gibraltar, or Jamaica, the lapse of time had not reconciled the proud and tenacious nation to their loss; nor was there on the part of the Americans the same traditional objection to the renewal of Spanish sovereignty over the two Floridas that was felt with reference to Canada.
Such, then, were the objects sought by the two nations, whose interposition changed the whole character of the American Revolutionary War. It is needless to say that they did not all appear among the causes, or pretexts, avowed for engaging in hostility; but sagacious English opinion of the day rightly noted, as embodying in a few words the real ground of action of the united Bourbon Courts, the following phrase in the French manifesto: "To avenge their respective injuries, and to put an end to that tyrannical empire which England has usurped, and claims to maintain upon the ocean." In short, as regards the objects of the war the allies were on the offensive, as England was thrown upon the defensive.
The tyrannical empire which England was thus accused, and not unjustly, of exercising over the seas, rested upon her great sea power, actual or latent; upon her commerce and armed shipping, her commercial establishments, colonies, and naval stations in all parts of the world. Up to this time her scattered colonies had been bound to her by ties of affectionate sentiment, and by the still stronger motive of self-interest through the close commercial connection with the mother-country and the protection afforded by the constant presence of her superior navy. Now a break was made in the girdle of strong ports upon which her naval power was based, by the revolt of the continental colonies; while the numerous trade interests between them and the West Indies, which were injured by the consequent hostilities, tended to divide the sympathies of the islands also. The struggle was not only for political possession and commercial use. It involved a military question of the first importance,—whether a chain of naval stations covering one of the shores of the Atlantic, linking Canada and Halifax with the West Indies, and backed by a thriving seafaring population, should remain in the hands of a nation which had so far used its unprecedented sea power with consistent, resolute aggressiveness, and with almost unbroken success.
While Great Britain was thus embarrassed by the difficulty of maintaining her hold upon her naval bases, which were the defensive element of her naval strength, her offensive naval power, her fleet, was threatened by the growth of the armed shipping of France and Spain, which now confronted her upon the field which she had claimed as her own, with an organized military force of equal or superior material strength. The moment was therefore favorable for attacking the great Power whose wealth, reaped from the sea, had been a decisive factor in the European wars of the past century. The next question was the selection of the points of attack—of the principal objectives upon which the main effort of the assailants should be steadily directed, and of the secondary objectives by which the defence should be distracted and its strength dissipated.
One of the wisest French statesmen of that day, Turgot, held that it was to the interest of France that the colonies should not achieve their independence. If subdued by exhaustion, their strength was lost to England; if reduced by a military tenure of controlling points, but not exhausted, the necessity of constant repression would be a continual weakness to the mother-country. Though this opinion did not prevail in the councils of the French government, which wished the ultimate independence of America, it contained elements of truth which effectually moulded the policy of the war. If benefit to the United States, by effecting their deliverance, were the principal object, the continent became the natural scene, and its decisive military points the chief objectives, of operations; but as the first object of France was not to benefit America, but to injure England, sound military judgment dictated that the continental strife, so far from being helped to a conclusion, should be kept in vigorous life. It was a diversion ready made to the hand of France and exhausting to Great Britain, requiring only so much support as would sustain a resistance to which the insurgents were bound by the most desperate alternatives. The territory of the thirteen colonies therefore should not be the principal objective of France; much less that of Spain.
The commercial value of the English West Indies made them tempting objects to the French, who adapted themselves with peculiar readiness to the social conditions of that region, in which their colonial possessions were already extensive. Besides the two finest of the Lesser Antilles, Guadeloupe and Martinique, which she still retains, France then held Sta. Lucia and the western half of Hayti. She might well hope by successful war to add most of the English Antilles, and thus to round off a truly imperial tropical dependency; while, though debarred from Jamaica by the susceptibilities of Spain, it might be possible to win back that magnificent island for an allied and weaker nation. But however desirable as possessions, and therefore as objects, the smaller Antilles might be, their military tenure depended too entirely upon control of the sea for them to be in themselves proper objectives. The French government, therefore, forbade its naval commanders to occupy such as they might seize. They were to make the garrisons prisoners, destroy the defences, and so retire. In the excellent military port of Fort Royal, Martinique, in Cap Français, and in the strong allied harbor of Havana, a fleet of adequate size found good, secure, and well-distributed bases; while the early and serious loss of Sta. Lucia must be attributed to the mismanagement of the French fleet and the professional ability of the English admiral. On shore, in the West Indies, the rival powers therefore found themselves about equally provided with the necessary points of support; mere occupation of others could not add to their military strength, thenceforth dependent upon the numbers and quality of the fleets. To extend occupation further with safety, the first need was to obtain maritime supremacy, not only locally, but over the general field of war. Otherwise occupation was precarious, unless enforced by a body of troops so large as to entail expense beyond the worth of the object. The key of the situation in the West Indies being thus in the fleets, these became the true objectives of the military effort; and all the more so because the real military usefulness of the West Indian ports in this war was as an intermediate base, between Europe and the American continent, to which the fleets retired when the armies went into winter quarters. No sound strategic operation on shore was undertaken in the West Indies except the seizure of Sta. Lucia by the English, and the abortive plan against Jamaica in 1782; nor was any serious attempt against a military port, as Barbadoes or Fort Royal, possible, until naval preponderance was assured either by battle or by happy concentration of force. The key of the situation, it must be repeated, was in the fleet.
The influence of naval power, of an armed fleet, upon the war on the American continent has also been indicated in the opinions of Washington and Sir Henry Clinton; while the situation in the East Indies, regarded as a field by itself, has been so largely discussed under the head of Suffren's campaign, that it needs here only to repeat that everything there depended upon control of the sea by a superior naval force. The capture of Trincomalee, essential as it was to the French squadron which had no other base, was, like that of Sta. Lucia, a surprise, and could only have been effected by the defeat, or, as happened, by the absence of the enemy's fleet. In North America and India sound military policy pointed out, as the true objective, the enemy's fleet, upon which also depended the communications with the mother-countries. There remains Europe, which it is scarcely profitable to examine at length as a separate field of action, because its relations to the universal war are so much more important. It may simply be pointed out that the only two points in Europe whose political transfer was an object of the war were Gibraltar and Minorca; the former of which was throughout, by the urgency of Spain, made a principal objective of the allies. The tenure of both these depended, obviously, upon control of the sea.
In a sea war, as in all others, two things are from the first essential,—a suitable base upon the frontier, in this case the seaboard, from which the operations start, and an organized military force, in this case a fleet, of size and quality adequate to the proposed operations. If the war, as in the present instance, extends to distant parts of the globe, there will be needed in each of those distant regions secure ports for the shipping, to serve as secondary, or contingent, bases of the local war. Between these secondary and the principal, or home, bases there must be reasonably secure communication, which will depend upon military control of the intervening sea. This control must be exercised by the navy, which will enforce it either by clearing the sea in all directions of hostile cruisers, thus allowing the ships of its own nation to pass with reasonable security, or by accompanying in force (convoying) each train of supply-ships necessary for the support of the distant operations. The former method aims at a widely diffused effort of the national power, the other at a concentration of it upon that part of the sea where the convoy is at a given moment. Whichever be adopted, the communications will doubtless be strengthened by the military holding of good harbors, properly spaced yet not too numerous, along the routes,—as, for instance, the Cape of Good Hope and the Mauritius. Stations of this kind have always been necessary, but are doubly so now, as fuel needs renewing more frequently than did the provisions and supplies in former days. These combinations of strong points at home and abroad, and the condition of the communications between them, may be called the strategic features of the general military situation, by which, and by the relative strength of the opposing fleets, the nature of the operations must be determined. In each of the three divisions of the field, Europe, America, and India, under which for sake of clearness the narrative has been given, the control of the sea has been insisted upon as the determining factor, and the hostile fleet therefore indicated as the true objective. Let the foregoing considerations now be applied to the whole field of war, and see how far the same conclusion holds good of it, and if so, what should have been the nature of the operations on either side.[232]
In Europe the home base of Great Britain was on the English Channel, with the two principal arsenals of Plymouth and Portsmouth. The base of the allied powers was on the Atlantic, the principal military ports being Brest, Ferrol, and Cadiz. Behind these, within the Mediterranean, were the dock-yards of Toulon and Cartagena, over against which stood the English station Port Mahon, in Minorca. The latter, however, may be left wholly out of account, being confined to a defensive part during the war, as the British fleet was not able to spare any squadron to the Mediterranean. Gibraltar, on the contrary, by its position, effectually watched over detachments or reinforcements from within the Straits, provided it were utilized as the station of a body of ships adequate to the duty. This was not done; the British European fleet being kept tied to the Channel, that is, to home defence, and making infrequent visits to the Rock to convoy supplies essential to the endurance of the garrison. There was, however, a difference in the parts played by Port Mahon and Gibraltar. The former, being at the time wholly unimportant, received no attention from the allies until late in the war, when it fell after a six months' siege; whereas the latter, being considered of the first importance, absorbed from the beginning a very large part of the allied attack, and so made a valuable diversion in favor of Great Britain. To this view of the principal features of the natural strategic situation in Europe may properly be added the remark, that such aid as Holland might be inclined to send to the allied fleets had a very insecure line of communication, being forced to pass along the English base on the Channel. Such aid in fact was never given.
In North America the local bases of the war at its outbreak were New York, Narragansett Bay, and Boston. The two former were then held by the English, and were the most important stations on the continent, from their position, susceptibility of defence, and resources. Boston had passed into the hands of the Americans, and was therefore at the service of the allies. From the direction actually given to the war, by diverting the active English operations to the Southern States in 1779, Boston was thrown outside the principal theatre of operations, and became from its position militarily unimportant; but had the plan been adopted of isolating New England by holding the line of the Hudson and Lake Champlain, and concentrating military effort to the eastward, it will be seen that these three ports would all have been of decisive importance to the issue. South of New York, the Delaware and Chesapeake Bays undoubtedly offered tempting fields for maritime enterprise; but the width of the entrances, the want of suitable and easily defended points for naval stations near the sea, the wide dispersal of the land forces entailed by an attempt to hold so many points, and the sickliness of the locality during a great part of the year, should have excepted them from a principal part in the plan of the first campaigns. It is not necessary to include them among the local bases of the war. To the extreme south the English were drawn by the ignis fatuus of expected support among the people. They failed to consider that even if a majority there preferred quiet to freedom, that very quality would prevent them from rising against the revolutionary government by which, on the English theory, they were oppressed; yet upon such a rising the whole success of this distant and in its end most unfortunate enterprise was staked. The local base of this war apart was Charleston, which passed into the hands of the British in May, 1780, eighteen months after the first expedition had landed in Georgia.