In choosing their ground for their objects, the Boers have shown remarkable aptitude. If overpowered and dislodged, unless routed and dispersed, the defender falls back continually upon the bases in his rear, recuperating his losses by reinforcements from them, while the victorious assailant must either press on with diminished numbers or must wait for reinforcements to come up, a delay that enables the defence still more to improve the next position, which, in a campaign of this sort, {p.134} has commonly been selected long before. It may be said here that this was precisely the character of the advance on Kimberley about to be narrated. In such a direct operation, by its very nature, the defence gains strength and shortens his line of communications to be defended, while the reverse conditions unremittingly drain the powers of the assailant. As an abstract military question there need be no hesitation in saying that the advance through the Orange Free State was in principle the correct plan, even under the existing conditions, as far as these are accurately known. But conditions are never accurately known to outsiders so immediately after a war. Even the hard bottom facts which ultimately appear, the residuum left after full publicity, and discussion, and side lights from all sources have done their work, do not correctly reproduce the circumstances as present to the mind of the general officer who decides. What is known now was doubtful then; what now is past and certain, was then future and contingent; what this and that subordinate, this force and that force could {p.135} endure and would endure we now know, but who could surely tell six months ago? Who, whatever his faith in the heroism and patience of the garrisons, believed in December, 1899, that Ladysmith and Kimberley and Mafeking could hold out, without relief, as long as they did? What therefore, between the known uncertainties of the past and the certainly imperfect information of the present, we, who had not the responsibilities of decision, may modestly refrain from positively judging the particular decision, even by the generally sound principles which commonly govern such cases. Warfare is an art, not a science; it knows no unvarying laws, and possesses neither specifics nor panaceas.