Titus Livius (Livy), The History of Rome, Book 37
William A. McDevitte, Sen. Class. Mod. Ex. Schol. A.B.T.C.D., Ed.

42. But that futile affair was soon the cause of real loss. For the auxiliaries in reserve, which were posted next, being terrified at the turn and disorder of the chariots, betook them- selves to flight, leaving all exposed as far as the post of the mailed horsemen; [2] to whom when the Roman cavalry, after dispersing the reserves, approached, they did not sustain their first onset. [3] Some fled, and others, being delayed by the weight of their coverings and armour, were put to the sword. The whole left wing then gave way, and the auxiliaries, posted between the cavalry and the phalanx, being thrown into confusion, the terror spread even to the centre. [4] Here the ranks were broken, and by the flying soldiers rushing in between them, the use of their long spears, called by the Macedonians sarissas, was hindered. The Roman legions advanced and discharged their javelins among them in disorder. [5] Even the elephants, standing in the way, did not deter the Roman soldiers, who had learned by experience in the African wars, both to evade the onset of the animal, and, getting at one side of it, either to ply it with darts, or, if they could come near enough, to wound its sinews with their swords. [6] The front of the centre was now almost crushed, and the reserve, being surrounded, [p. 1700]was attacked on the rear, when the Romans perceived their troops in another quarter flying, and heard shouts of dismay almost close to their camp. [7] For Antiochus, who commanded the right wing, having observed that the enemy, through confidence in the river, had placed no reserve there, except four troops of horse, and that these, keeping close to the infantry, left an open space on the bank of the river, made a charge on them, with a body of auxiliaries and mailed horsemen. [8] He not only attacked them in front, but having surrounded the wing in the direction of the river, pressed them in flank also; until the routed cavalry first, and then the infantry that were next them, fled with precipitation to the camp.