The Soldier Boy by Oliver Optic

Tom Somers floated with the tide of humanity that was setting away from the scene of disaster and defeat. The panic that prevailed was even more fearful than the battle, for wounded and dying men were mercilessly trodden down by the feet of the horses, and run over by the wheels of the cannon and the baggage wagons. Though the battle was ended, the rebels still poured storms of shot and shell into the retreating, panic-stricken host.

Tom did not know where to go, for there were panic and death on all sides of him. The soldiers were flying in every direction, some of them into the very arms of their remorseless enemies. But the woods seemed to promise the most secure retreat from the fury of the Black Horse Cavalry, which was now sweeping over the battle-field. The Zouave ran in this direction, and our soldier boy followed him. Now that the excitement of the conflict was over, the enthusiasm which had buoyed him up began to subside. The day was lost; all hopes of glory had fled; and a total defeat and rout were not calculated to add much strength to his over-tasked limbs.