_Second Object_.--To repel an enemy expedition, striving to establish a base in the Caribbean, preparation would have to be made for as prompt a mobilization as possible; for although the threat of invasion of our coast would not carry with it the idea of such early execution as would a direct attack on New York, yet the actual establishment of a base so near our shores would give such advantages to a hostile nation for a future invasion, that measures to prevent it should be undertaken with the utmost possible thoroughness and despatch; because the operation of establishing a base involves many elements of difficulty that an active defender can hinder by aeroplane attacks, etc.; whereas, after a base has once been established and equipped with appropriate defenses, attacks upon it are much less productive of results. The endeavor to establish a base and the opposing effort to prevent it, will offer many opportunities for excellent work on both sides. Practically all the elements of naval force will be engaged, and events on the largest possible scale may be expected. The operations will naturally be more extended both in time and distance than in the case of a direct attack upon our coast, and therefore the task of logistics will be greater. Actual battle between large forces; minor engagements among aircraft, scouts, submarines, and destroyers; attacks on the train of the invader--even conflicts on shore--will be among the probabilities. _Third Object_.--To send a large expedition to carry out naval operations in far distant waters--in the south Atlantic, for instance, to prevent the extension of a monarchical government in South America, or in the western Pacific to defend our possessions there--calls for plans involving more logistical calculation and execution, but permitting a more leisurely procedure. The distances to be traversed are so great, the lack of bases is so distinct and so difficult to remedy, and the impossibility of arriving in time to prevent the seizing of land by any hostile expedition is so evident, that they combine to necessitate great thoroughness of preparation and only such a measure of despatch as can be secured without endangering thoroughness. Whether the projected expedition shall include troops, the conditions at the time must dictate. Troops with their transports will much complicate and increase the difficulties of the problem, and they may or may not be needed. The critical results can be accomplished by naval operations only; since nothing can be accomplished if the naval part of the expedition fails to secure the command of the sea; and the troops cannot be landed until it has been secured, unless the fact of securing it can safely be relied on in advance. For these reasons, the troops may be held back until the command of the sea has been secured, and then sent out as an independent enterprise. This would seem the more prudent procedure in most cases, since one successful night