We have had all the difficulties to contend with resulting from inexperienced riders and untrained horses. No one who has not beheld the scene, can imagine the awkward appearance of a troop of recruits mounted on horses unaccustomed to the saddle. The sight is one of the most laughable that can be witnessed. We have seen the attempt made to put such a troop into a gallop across a field. Fifty horses and fifty men instantly became actuated by a hundred different wills, and dispersed in all directions--some of the riders hanging on to the pommels, with their feet out of the stirrups, others tugging away at the bridles, and not a few sprawling on the ground. After a few months' drills, however, a different scene is presented, and an old troop horse becomes so habituated to his exercises that not only will he perform all the evolutions without guidance, but will even refuse to leave the ranks, though under the most vigorous incitements of whip and spur. An officer friend was once acting as cavalier to a party of ladies on horseback at a review, when, unfortunately, the troop in which his horse belonged happening to pass by, the animal bolted from the group of ladies, and took his accustomed place in the ranks, nor could all the efforts of his rider disengage him. Finally, our friend was obliged to dismount, and, holding the horse by the bit, _back_ him out of the troop to his station with the party of ladies--a feat performed amid much provoking laughter. Cavalry can operate in masses only when circumstances are favorable--the country open, and the ground free from obstructions. Yet it is in masses alone that it can be effective, and it can triumph against infantry only by a _shock_--from the precipitation of its weight upon the lines, crushing them by the onset. Before the time of Frederic the Great, the Prussian horsemen resembled those to be seen at a militia review--they were a sort of picture soldiers, incapable of a vigorous charge. He revolutionized the service by teaching that cavalry must achieve success by a rapid onset, not stopping to fire themselves, and not regarding the fire of their opponents. By practising these lessons, they were able to overthrow the Austrian infantry. But if the force of a charge is dissipated by obstructions on the ground, or is broken by the fire of the assailed, the effectiveness of cavalry, as a participant in the manoeuvres of a battle field, is entirely destroyed.