In the case of a war with a nation that had only one naval home base, it is clear that the best position for our distant base would be one as close to the enemy's base as possible; because, if placed there, our fleet, if it were the more powerful, could do more to injure the enemy's fleet, or prevent its going out, than if placed at any point more distant from the enemy's base; and if it were less powerful, it could do more to cut the enemy's communications, because it could attack them at or near their source.
A poor position would be one far away from both countries, and far away from the line joining them. In the case of a war between this country and Norway, for instance, a very poor position for a naval base would be a spot near—say Juan Fernandez—in the south Pacific.
In case the enemy country has two home bases of equal importance, the best position for our base clearly would be one equidistant from them, and as near to each as practicable. If the distance from our base to a point half-way between the two bases is shorter than is the distance to it from either base, then a fleet at our base could probably prevent the junction of two forces issuing from those two bases—assuming, of course, that we had a proper system of scouting. Our fleet would be able to operate on what are often called "interior lines"—a technical expression that has great efficacy in confusing a simple matter. It is also assumed that our fleet is considerably stronger than either of the two separated enemy forces; otherwise our case would be hopeless.
If the two home bases of the enemy are unequal in importance, it would seem that our base should be nearer to the important base than to the other. More strictly speaking, it should be nearer to the base from which the larger force may be expected to come out.
If the enemy country have three or more bases, from which parts of a fleet may be expected to come out, the question seems a little more complex; but nevertheless, since the first duty of our fleet would probably be to prevent junctions or a junction, of the separated parts of the enemy's fleet, the best position for our home base would be at a point about equally distant from them all, and as close to them as possible. In the wars between Great Britain and France in the early part of the nineteenth century, the base of the British fleet for operations on the western and northern coasts of France was as close to the enemy home bases as practicable—though the base was England itself. For operations on France's southern coast, the base was at Gibraltar, or some Mediterranean island.
That any country should be able to hold a distant base close to the home base of a possible naval enemy might seem impossible, if we did not know that Great Britain holds Bermuda and Jamaica near to our own coast, and Hong-Kong actually inside of China, all far away from Britain; besides Malta and Gibraltar in the Mediterranean, nearer to the coasts of sometime enemies than to her own. That the United States should own a base far from her own coasts, and near those of other countries, might seem improbable, were it not for the fact that Guam is such a base, and is so situated. It is true that Guam is not strictly a naval base, because it is not so equipped or fortified; but we are thinking now of position only.
In case the enemy country has several home bases, and it is impossible to have our distant base so near to them as to prevent the junction of parts of a fleet issuing from them, the value of the base is less than it otherwise would be.
In this case, which is the one in which our country is actually concerned, because of its great distance from other countries, its value becomes merely the usual value attaching to a naval base; and the fact that the entire enemy fleet can operate as a unit, that it can divide into separate forces at will near its own shores, or send out detachments to prey on the long line of communications stretching from our distant base to that base's home, necessitates that the base be fortified in the strongest possible way, and provided with large amounts of supplies. Its principal function in war would be to shorten the long trip that our vessels would have to make without refreshment, and therefore the length of their lines of communications, and to enable our vessels to arrive in enemy's waters in better condition of readiness for battle than would otherwise be the case.
We have thus far considered the best position for an advanced naval base, in the case of operations against one country only.
It seems clear that, if we are to consider operations against two countries separately, and at different times, we should be led to conclude that the case of each country should be decided individually; in the case of wars with Norway and Portugal, for instance, the best places for our two bases would be as close to the home bases of those countries as possible; and even in the case of fighting two simultaneously, the conclusion would be the same, if the two countries were in widely different directions from us—as are Switzerland and China. If we consider the case of war against two contiguous countries simultaneously, however, it would seem better to have one base, situated similarly toward the home bases of the two countries as toward two different home bases in one country—since the two countries would be, in effect, allies; and their fleets would act in reality like separated portions of one fleet.