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. As the United States possesses no island on the Atlantic side which is nearer to foreign countries than to our own, and as our interests for the immediate future lie mostly on the Atlantic side, it may be well now to apply the general principles just considered to the question of where is a naval base most urgently needed under actual conditions. Imagining a war between us and some one European naval Power, and imagining a war also between us and two or three allied European naval Powers, and realizing the length of our Atlantic and Gulf coasts, extending from Maine to Panama, a glance at the map shows us that, apart from the home naval bases on our continental coasts, the position on American soil which is the closest to European bases is on the little island of Culebra, which occupies a salient in the northeastern end of the Caribbean Sea.[*] [Footnote *: The acquisition by the United States of the island of Saint Thomas, about 20 miles east of Culebra, if accomplished, will extend the salient just so much farther toward Europe.]