The great value of hasty entrenchments, and the immeasurable superiority of fire action over “cold steel,” were not the only lessons taught by our war which were unheeded by Austrian soldiers steeped in conservatism and basking serenely in the sunshine of their own military traditions. Their use of cavalry showed either an ignorance of, or contempt for, the experience of the American armies; but, in this respect, the Austrians were not less perspicacious than their adversaries. The campaign produced some fine examples of combats between opposing forces of cavalry; but it also produced many instances in which the Austrians hurled their cavalry against intact infantry armed with breech-loaders, only to learn from their own defeat and an appalling list of killed and wounded, that they had applied the tactics of a past age to the conditions of a new era. Both armies seem to have been afraid to let their cavalry get out of sight, and to have reserved their mounted troops solely for use on the field of battle. If they had studied the great raids of the American cavalry leaders, they would have learned a lesson which there were excellent opportunities to apply. It would, probably, have been impossible for the Austrian cavalry to cut the Prussian communications before the junction of the invading armies was effected. A cavalry column attempting to move around the left of Frederick Charles would almost certainly have been caught between the First Army and the impassable Isergebirge, and captured before doing any damage. A column moving around the Prussian right, into Saxony, would have encountered the cavalry division of Von Mülbe’s reserve corps, to say nothing of the infantry and artillery; and the movement would, doubtless, have come to naught. A movement against the communications of the Crown Prince could have been made only _via_ the valley of the Oder, where it could have been effectually opposed. But it is certain that after the battle of Königgrätz the Austrians had it in their power to balk the advance of Von Moltke by operating with cavalry against his communications. In this case the raiders would have been operating in their own country, and among a friendly population; the railways could have been cut without difficulty, and the cavalry could have retreated without serious danger of being intercepted. The effect upon the invading army does not admit of doubt. We have seen that, with unobstructed communications, the Prussian army was subjected to no slight distress, after the battle of Münchengrätz, for want of rations. Even two days after peace had been agreed upon, the Austrian garrison of Theresienstadt, ignorant of the termination of the war, by a successful sally destroyed the railway bridge near Kralup. The line of communication of the Prussians with the secondary base of supplies at Turnau was thus broken; and, though hostilities were at an end, the invaders were subjected to much inconvenience. It is easy