1st—Defense of the coast against bombardment and invasion.

2d—Defense of the trade routes traversed by ships carrying the exports and imports of the country.

3d—Defense of the national policy, including defense of the nation's reputation, honor, and prestige.

Of these, defense of the coast against bombardment and invasion is the easiest, and defense of the national policy the most difficult; because in preventing bombardment and invasion the defender has the strategical advantage of being nearer home than the adversary; while in the defense of a country's policy, a naval force may have to "assume the offensive," and go even to the far distant coasts of the enemy—as the Russian fleet went to Tsushima, where it met its death.

In that part of naval defense which is concerned with trade routes, the strategical advantage must go, in general, to that side which is the nearer to the locality where the decisive battle may occur.

In laying down a policy of naval defense, however, it is not necessary to consider these three parts separately, because no nation can ever tell whether in the distant future its naval defense will have to be used directly for any one of the three, or for all. In general terms, it may be stated that in nearly all naval wars the fleet has been used more for the defense of the nation's policy than for the actual defense of the coasts or the trade routes. This does not mean that there has never been a bombardment or invasion, or that the defense of trade routes may not have been the cause of the war itself; but it does mean that in actual wars bombardment or invasion has been rare, the capture of merchant vessels has played a minor part, and the deciding events have been battles between two fleets, that were often far from the land of either.

Owing to the fact that within modern times most of the important countries of the world have been those of continental Europe, with frontiers contiguous, and in fact identical, the defense of a country has been largely committed to the army, and most of the wars have been on land. The country standing in exception to this has been Great Britain, whose isolated and insular situation demanded a defense that was strictly naval. The tremendous advance in recent times of the engineering arts, by which ships became larger and faster, and able to carry more powerful and accurate guns than ever before, has enhanced the value of naval power and enabled Great Britain to reach all over the surface of the earth, and become more powerful than any continental nation. Thus she has made out of the very weakness of her position a paramount tower of strength.

Naval defense was taken up systematically in Great Britain in the eighth century by King Offa, to whom is credited the maxim, "He who would be secure on land must be supreme at sea"; but it must have dropped to a low ebb by 1066, for William of Normandy landed in England unopposed. Since that time Great Britain's naval defense, committed to her navy, has increased steadily in effectiveness and power, keeping pace with the increase in the national interests it defended, and utilizing all the growing resources of wealth and science which the world afforded. Until the present crisis, Great Britain's naval defense did its most important work during Napoleon's time, when Great Britain's standing, like the standing of every other European nation, was subjected to a strain that it could hardly bear. So keenly, however, did the nation and the nation's great leader, Pitt, realize the situation that the most strenuous measures were adopted to keep the navy up, press-gangs even visiting the houses of subjects of the King, taking men out and putting them by force on board his Majesty's ships. But the British navy, even more than the British army, brought Great Britain safe out of the Napoleonic danger, and made the British the paramount nation of the world.

Since then Great Britain has waxed more and more powerful, her avowed policy being that her navy should be equal to any other two; realizing that her aloofness in point of national characteristics and policy from all other nations made it possible that a coalition of at least two great nations might be pitted against her at a time when she could not get an ally. Accompanying the growth of the British navy has been the establishment of British foreign trade, British colonies, and British bases from which the navy could work, and the general making of a network of British commerce and British power over the surface of the earth. No other nation has ever dominated so large a part of the surface of the globe as has Great Britain during the last two centuries; and she has done it by means of her naval power. This naval power has been, in the language of Great Britain, for the "imperial defense"; not for coast defense alone, but for the defense of all the imperial interests, commercial and political, and even the imperial prestige. And this defense of prestige, it may here be remarked, is not a vainglorious defense, not an exhibition of a swaggering, swashbuckling spirit, but a recognition of the fact that the minds of men are so constituted that the prestige of an individual, an organization, or a nation has a practical value and is an actual force. No government that appreciates its responsibilities will willingly risk the prestige of the nation which it governs, because it knows that any weakening of it will be followed by a weakening of influence and a consequent increase of difficulty in attaining some "end in view."

The greatness of the British navy, compared with that of the British army and the other elements of Great Britain's government, has taken on magnified dimensions during the last half century. So long as war-ships used sails as their principal motive power, so long were they forced to employ methods of construction and equipment that forbade the efficient employment of high-power guns, the attainment of great speed, and the use of instruments of precision; so long, in other words, was their military effectiveness prevented from increasing greatly. But when the British navy decided to abandon sail power altogether and propel their ships by steam, a new phase was entered upon, in which every resource of the engineering arts and the physical sciences was called into requisition; and now, on board a dreadnaught, battle cruiser, destroyer, or submarine, can be found the highest examples of mechanical and electrical art and science. Every material resource which the brain and wealth of man can compass is enlisted in her naval defense; and in order to take advantage of the rapidity and certainty of movement they afford for operating fleets and ships, there has been a great advance in methods of operation, or, in military parlance, "staff work." To assist this work, the radio, the cable, and even the humble typewriter have contributed their essential share, with the result that to Great Britain's naval defense there has been devoted an extraordinary degree of efficiency, continuous effort, a more varied activity, and a larger expenditure of money than to any other object of man's activity.