Such cumbrous terminology is too forbidding to use. It serves only to mark that the middle stage differs logically from the third as much as it does from the first. In practice it comes to this. If we are going to use concentration in its natural sense, we must regard it as something that comes after complete mobilisation and stops short of the formation of mass. In naval warfare at least this distinction between concentration and mass is essential to clear appreciation. It leads us to conclusions that are of the first importance. For instance, when once the mass is formed, concealment and flexibility are at an end. The further, therefore, from the formation of the ultimate mass we can stop the process of concentration the better designed it will be. The less we are committed to any particular mass, and the less we indicate what and where our mass is to be, the more formidable our concentration. To concentration, therefore, the idea of division is as essential as the idea of connection. It is this view of the process which, at least for naval warfare, a weighty critical authority has most strongly emphasised. "Such," he says, "is concentration reasonably understood--not huddled together like a drove of sheep, but distributed with a regard to a common purpose, and linked together by the effectual energy of a single will."[12] Vessels in a state of concentration he compares to a fan that opens and shuts. In this view concentration connotes not a homogeneous body, but a compound organism controlled from a common centre, and elastic enough to permit it to cover a wide field without sacrificing the mutual support of its parts. [12] Mahan, _War of 1812_, i, 316. If, then, we exclude the meaning of mere assembling and the meaning of the mass, we have left a signification which expresses coherent disposal about a strategical centre, and this it will be seen gives for naval warfare just the working definition that we want as the counterpart of strategic deployment on land. The object of a naval concentration like that of strategic deployment will be to cover the widest possible area, and to preserve at the same time elastic cohesion, so as to secure rapid condensations of any two or more of the parts of the organism, and in any part of the area to be covered, at the will of the controlling mind; and above all, a sure and rapid condensation of the whole at the strategical centre.