[8] An interesting proof of the weight attributed to the naval power of Great Britain by a great military authority will be found in the opening chapter of Jomini's "History of the Wars of the French Revolution." He lays down, as a fundamental principle of European policy, that an unlimited expansion of naval force should not be permitted to any nation which cannot be approached by land,--a description which can apply only to Great Britain. [9] Gougeard: La Marine de Guerre; Richelieu et Colbert. [10] Whatever may be thought of Clerk's claim to originality in constructing a system of naval tactics, and it has been seriously impugned, there can be no doubt that his criticisms on the past were sound. So far as the author knows, he in this respect deserves credit for an originality remarkable in one who had the training neither of a seaman nor of a military man. [11] La Serre: Essais Hist. et Crit. sur la Marine Française. [12] Lapeyrouse-Bonfils: Hist. de la Marine Française. [13] Jurien de la Gravière: Guerres Maritimes. [14] Since the above was written, the secretary of the navy, in his report for 1889, has recommended a fleet which would make such a blockade as here suggested very hazardous. [15] The word "defence" in war involves two ideas, which for the sake of precision in thought should be kept separated in the mind. There is defence pure and simple, which strengthens itself and awaits attack. This may be called passive defence. On the other hand, there is a view of defence which asserts that safety for one's self, the real object of defensive preparation, is best secured by attacking the enemy. In the matter of sea-coast defence, the former method is exemplified by stationary fortifications, submarine mines, and generally all immobile works destined simply to stop an enemy if he tries to enter. The second method comprises all those means and weapons which do not wait for attack, but go to meet the enemy's fleet, whether it be but for a few miles, or whether to his own shores. Such a defence may seem to be really offensive war, but it is not; it becomes offensive only when its object of attack is changed from the enemy's fleet to the enemy's country. England defended her own coasts and colonies by stationing her fleets off the French ports, to fight the French fleet if it came out. The United States in the Civil War stationed her fleets off the Southern ports, not because she feared for her own, but to break down the Confederacy by isolation from the rest of the world, and ultimately by attacking the ports. The methods were the same; but the purpose in one case was defensive, in the other offensive.