If cavalry can succeed, especially in battles of several days' duration, in interrupting the hostile supplies from the rear, in surprising the enemy's reserves with fire, causing him heavy loss and compelling him to deploy against it, or if any advancing portions of the enemy's army can be brought to a halt and prevented from reaching the battlefield at the right time, greater results will probably be obtained than by a doubtful charge. This is quite apart from the great moral impression which such action must produce on leaders and troops when the alarm suddenly re-echoes from the rear, and the shrapnel of the cavalry carries confusion and consternation amongst the reserves and supports of the fighting-line. The enemy's artillery, also, firing from covered positions, and otherwise so difficult to reach, may then fall a prey to a bold cavalry, and will offer opportunities for a success of far-reaching importance. Such action must, of course, be conducted with a due co-operation between mounted and dismounted action. Against intact hostile reserves the firearm will be principally used, and endeavour must be made to surprise them in the formation of assembly or on the march. Against columns of wagons, also, it will be well to commence with fire action, by shooting down the horses of the leading teams, and so bringing the columns to a halt. They must then, however, be actually taken possession of and taken away or destroyed, in so far as this cannot be done by artillery fire. The cavalry must therefore endeavour to be ever active, and to co-operate unceasingly by damaging the enemy and shaking his morale. Great results can, however, only be obtained if antiquated views, handed down from time immemorial, are discarded, and the demands of modern war and the capabilities of modern cavalry are recognised. It is not a question as to whether we cavalry men are to fight mounted or dismounted; but that we must be prepared and determined to take part in the decision, and to employ the whole of our great strength and mobility to this end. 2. _The Army Cavalry as a Reserve behind the Front_ The same principles hold good for those portions of the army cavalry which find themselves _behind_ the fighting-line, and not on the exposed flank. Such a position is generally, indeed, undesirable, but may be the outcome of circumstances.