of policy; they arose from an altered policy, produced by the French Revolution, not only in France, but over the rest of Europe as well. This policy had called forth other means and other powers, by which it became possible to conduct war with a degree of energy which could not have been thought of otherwise.
Therefore, the actual changes in the art of war are a consequence of alterations in policy; and, so far from being an argument for the possible separation of the two, they are, on the contrary, very strong evidence of the intimacy of their connexion.
Therefore, once more: war is an instrument of policy; it must necessarily bear its character, it must measure with its scale: the conduct of war, in its great features, is therefore policy itself, which takes up the sword in place of the pen, but does not on that account cease to think according to its own laws.