But the first business of every theory is to clear up conceptions and ideas which have been jumbled together, and, we may say, entangled and confused; and only when a right understanding is established, as to names and conceptions, can we hope to progress with clearness and facility, and be certain that author and reader will always see things from the same point of view.  Tactics and strategy are two activities mutually permeating each other in time and space, at the same time essentially different activities, the inner laws and mutual relations of which cannot be intelligible at all to the mind until a clear conception of the nature of each activity is established.

He to whom all this is nothing, must either repudiate all theoretical consideration, or his understanding has not as yet been pained by the confused and perplexing ideas resting on no fixed point of view, leading to no satisfactory result, sometimes dull, sometimes fantastic, sometimes floating in vague generalities, which we are often obliged to hear and read on the conduct of War, owing to the spirit of scientific investigation having hitherto been little directed to these subjects.

CHAPTER II.  ON THE THEORY OF WAR

1.  The first conception of the “Art of war” Was merely the preparation of the armed forces.

Formerly by the term “Art of War,” or “Science of War,” nothing was understood but the totality of those branches of knowledge and those appliances of skill occupied with material things.  The pattern and preparation and the mode of using arms, the construction of fortifications and entrenchments, the organism of an army and the mechanism of its movements, were the subject; these branches of knowledge and skill above referred to, and the end and aim of them all was the establishment of an armed force fit for use in War.  All this concerned merely things belonging to the material world and a one-sided activity only, and it was in fact nothing but an activity advancing by gradations from the lower occupations to a finer kind of mechanical art.  The relation of all this to War itself was very much the same as the relation of the art of the sword cutler to the art of using the sword.  The employment in the moment of danger and in a state of constant reciprocal action of the particular energies of mind and spirit in the direction proposed to them was not yet even mooted.

2.  True war first appears in the art of sieges.