Next we have to note that where the enemy's squadrons are widely distributed in numerous bases, we cannot always simplify the problem by leaving some of them open so as to entice him to concentrate and reduce the number of ports to be watched. For if we do this, we leave the unwatched squadrons free for sporadic action. Unless we are sure he intends to concentrate with a view to a decisive action, our only means of simplifying the situation is to watch every port closely enough to interfere effectually with sporadic action. Then, sporadic action being denied him, the enemy must either do nothing or concentrate.
The next principle is flexibility. Concentration should be so arranged that any two parts may freely cohere, and that all parts may quickly condense into a mass at any point in the area of concentration. The object of holding back from forming the mass is to deny the enemy knowledge of our actual distribution or its intention at any given moment, and at the same time to ensure that it will be adjusted to meet any dangerous movement that is open to him. Further than this our aim should be not merely to prevent any part being overpowered by a superior force, but to regard every detached squadron as a trap to lure the enemy to destruction. The ideal concentration, in short, is an appearance of weakness that covers a reality of strength.
I. INHERENT DIFFERENCES IN THE CONDITIONS OF WAR ON LAND AND ON SEA
Before attempting to apply the foregoing general principles in a definite manner to the conduct of naval war, it is necessary to clear the ground of certain obstacles to right judgment. The gradual elucidation of the theory of war, it must be remembered, has been almost entirely the work of soldiers, but so admirable is the work they have done, and so philosophical the method they have adopted, that a very natural tendency has arisen to assume that their broad-based conclusions are of universal application. That the leading lines which they have charted are in a certain sense those which must govern all strategy no one will deny. They are the real pioneers, and their methods must be in the main our methods, but what we have to remember is that the country we have to travel is radically different from that in which they acquired their skill.