It often occurred during the campaign of 1824, that the cavalry being in the rear, were, by a succession of various obstructions, prevented from accomplishing the day's march before nightfall. It then became necessary for every man to dismount, and to lead the two animals in his charge, to avoid going astray, or tumbling headlong down the most frightful precipices. But the utmost precaution did not always prevent the corps from losing their way. Sometimes men, at the head of a battalion, would continue to follow the windings of a deafening torrent, instead of turning abruptly to the right or left, up some rocky acclivity, over which lay their proper course; whilst others who chanced to be right, would pursue the proper track. The line was so drawn out, that there were unavoidably many intervals, and it was easy for such mistakes to occur, although trumpeters were placed at regular distances expressly to prevent separation. One party was frequently heard hallowing from an apparently fathomless ravine, to their comrades passing over some high projecting summit, to know if they were going right. These would answer with their trumpets; but it often occurred that both parties had lost their road. The frequent sound of trumpets along the broken line--the shouting of officers to their men at a distance--the neighing of horses, and the braying of mules, both men and animals being alike anxious to reach a place of rest, produced a strange and fearful concert, echoed, in the darkness of the night, from the horrid solitude of the Andes. After many fruitless attempts to discover the proper route, a halt until daybreak was usually the last resource. The sufferings of the men and animals on those occasions were extreme. The thermometer was generally below the freezing point, amidst which they were sometimes overtaken by terrific snow-storms. These difficulties and hardships were not so severely felt by the infantry, for, unincumbered with the charge of horses, it was an easy matter for them to turn back, whereas it was often impossible for the cavalry to do so, the path on the mountain-side being generally too narrow to admit of horses turning round. It happened more than once, that the squadron in front, having ascertained that it had taken a wrong direction, was nevertheless compelled to advance until it reached some open spot, where the men were enabled to assemble, and wait for the hindmost of their comrades, and then retrace their steps. After having pursued this plan, the troops have met another squadron following the same track; and, under such circumstances, it has required hours for either to effect a countermarch. In this complicated operation many an animal was hurled down the precipice and dashed to pieces, nor did their riders always escape a similar fate.