The War of Secession produced the first practical machine-gun,—the Gatling,—though such guns were not used to any extent. The machine-gun has, in fact, passed through a long period of gestation, and it is only in recent years that it can be said to have attained its full birth. Our great war was also noted for the introduction of torpedoes. These peculiar weapons had, it is true, been devised may years before; and Robert Fulton had, in the early part of the century, devoted his inventive genius to the production of a submarine torpedo, which, however, was never practically tested in war. It was not until the contest of 1861–65 that torpedoes were of any practical use. The high explosives of the present day being then unknown, these torpedoes depended for their destructive force upon gunpowder alone. Yet crude and insignificant though they were in comparison with the mighty engines of destruction now known by the same name, they accomplished great results in more than one instance. The destruction of the Housatonic off Charleston, the sinking of the Tecumseh in Mobile Bay, and Cushing’s daring destruction of the Albemarle, gave notice to the world that a new and terrible engine of warfare had made its appearance. But it was not merely by the production of new weapons that the great American war was characterized. It marked the turning-point in tactics as well. The first efforts of our great armies of raw volunteers were as crude as the warfare of untrained troops always is, and it was fortunate that we were opposed to a foe as unpracticed as ourselves; but as the troops gained experience in war, acquired the necessary military instruction,—in brief, learned their trade and became regulars in all but name,—they displayed not only a steadfast prowess, but a military skill that placed the veteran American soldier at the head of the warriors of the world. The art of constructing hasty intrenchments on the field of battle grew out of the quickness of the American soldier to appreciate the necessity of providing defensive means to neutralize, in some degree, the greatly increased destructive effect of improved arms. In this respect he was thirteen years in advance of the European soldier, for hasty intrenchments did not appear in Europe until the Turco-Russian War. True, intrenchment on the field of battle was as old as war itself; but the American armies were the first that developed a system of quickly covering the entire front of an army with earthworks hastily thrown up in the presence of the enemy, and often actually under fire. Skirmishers were no longer used merely to feel and develop the enemy; but in many of our battles, notably in Sherman’s campaign in Georgia, the engagement was begun, and fought to the end, by strong skirmish lines successively reinforced from the main body, which they gradually absorbed in the course of the action. Here, too, the American soldier was fully six years in advance