Both the consuls and all the strength of Rome being now opposed to Hannibal, made it sufficiently obvious that the Roman empire could either be defended by those forces, or that there was no other hope left. Yet the one consul being dispirited by the battle of the cavalry and his own wound, wished operations to be deferred: the other having his spirits unsubdued, and being therefore the more impetuous, admitted no delay. The tract of country between the Trebia and the Po was then inhabited by the Gauls, who, in this contest of two very powerful states, by a doubtful neutrality, were evidently looking forward to the favour of the conqueror. The Romans submitted to this conduct of the Gauls with tolerable satisfaction, provided they did not take any active part at all; but the Carthaginian bore it with great discontent, giving out that he had come invited by the Gauls to set them at liberty. On account of that resentment, and in order that he might at the same time maintain his troops from the plunder, he ordered two thousand foot and a thousand horse, chiefly Numidians, with some Gauls intermixed, to lay waste all the country straightforward as far as the banks of the Po. The Gauls, being in want of assistance, though they had up to this time kept their inclinations doubtful, are forced by the authors of the injury to turn to some who would be their supporters; and having sent ambassadors to the consul, they implore the aid of the Romans in behalf of a country which was suffering for the too great fidelity of its inhabitants to the Romans. Neither the cause nor the time of pleading it was satisfactory to Cornelius; and the nation was suspected by him, both on account of many treacherous actions, and though others might have been forgotten through length of time, on account of the recent perfidy of the Boii. Sempronius, on the contrary, thought that it would be the strongest tie upon the fidelity of the allies, if those were defended who first required support. Then, while his colleague hesitated, he sends his own cavalry, with about a thousand spearmen on foot in their company, to protect the Gallic territory beyond the Trebia. These, when they had unexpectedly attacked the enemy while scattered and disordered, and for the most part encumbered with booty, caused great terror, slaughter, and flight, even as far as the camp and outposts of the enemy; whence being repulsed by the numbers that poured out, they again renewed the fight with the assistance of their own party. Then pursuing and retreating in doubtful battle, though they left it at last equal, yet the fame of the victory was more with the Romans than the enemy.
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But to no one did it appear more important and just than to the consul himself. He was transported with joy "that he had conquered with that part of the forces with which the other consul had been defeated; that the spirits of the soldiers were restored and revived; that there was no one, except his colleague, who would wish an engagement delayed; and that he, suffering more from disease of mind than body, shuddered, through recollection of his wound, at arms and battle. But others ought not to sink into decrepitude together with a sick man. For why should there be any longer protraction or waste of time? What third consul, what other army did they wait for? The camp of the Carthaginians was in Italy, and almost in sight of the city. It was not Sicily and Sardinia, which had been taken from them when vanquished, nor Spain on this side of the Iberus, that was their object, but that the Romans should be driven from the land of their fathers, and the soil in which they were born. How deeply," he continued, "would our fathers groan, who were wont to wage war around the walls of Carthage, if they should see us their offspring, two consuls and two consular armies, trembling within our camps in the heart of Italy, while a Carthaginian had made himself master of all the country between the Alps and the Apennine!" Such discourses did he hold while sitting beside his sick colleague, and also at the head-quarters, almost in the manner of an harangue. The approaching period of the elections also stimulated him, lest the war should be protracted till the new consuls were chosen, and the opportunity of turning all the glory to himself, while his colleague lay sick. He orders the soldiers, therefore, Cornelius in vain attempting to dissuade him, to get ready for an immediate engagement. Hannibal, as he saw what conduct would be best for the enemy, had scarce at first any hope that the consuls would do any thing rashly or imprudently, but when he discovered that the disposition of the one, first known from report, and afterwards from experience, was ardent and impetuous, and believed that it had been rendered still more impetuous by the successful engagement with his predatory troops, he did not doubt that an opportunity of action was near at hand. He was anxious and watchful not to omit this opportunity, while the troops of the enemy were raw, while his wound rendered the better of the two commanders useless, and while the spirits of the Gauls were fresh; of whom he knew that a great number would follow him with the greater reluctance the farther they were drawn away from home. When, for these and similar reasons, he hoped that an engagement was near and desired to make the attack himself, if there should be any delay; and when the Gauls, who were the safer spies to ascertain what he wished, as they served in both camps, had brought intelligence that the Romans were prepared for battle, the Carthaginian began to look about for a place for an ambuscade.
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Between the armies was a rivulet, bordered on each side with very high banks, and covered around with marshy plants, and with the brushwood and brambles with which uncultivated places are generally overspread; and when, riding around it, he had, with his own eyes, thoroughly reconnoitred a place which was sufficient to afford a covert even for cavalry, he said to Mago his brother: "This will be the place which you must occupy. Choose out of all the infantry and cavalry a hundred men of each, with whom come to me at the first watch. Now is the time to refresh their bodies." The council was thus dismissed, and in a little time Mago came forward with his chosen men. "I see," said Hannibal, "the strength of the men; but that you may be strong not only in resolution, but also in number, pick out each from the troops and companies nine men like yourselves: Mago will show you the place where you are to lie in ambush. You will have an enemy who is blind to these arts of war." A thousand horse and a thousand foot, under the command of Mago, having been thus sent off, Hannibal orders the Numidian cavalry to ride up, after crossing the river Trebia by break of day, to the gates of the enemy, and to draw them out to a battle by discharging their javelins at the guards; and then, when the fight was commenced, by retiring slowly to decoy them across the river. These instructions were given to the Numidians: to the other leaders of the infantry and cavalry it was commanded that they should order all their men to dine; and then, under arms and with their horses equipped, to await the signal. Sempronius, eager for the contest, led out, on the first tumult raised by the Numidians, all the cavalry, being full of confidence in that part of the forces; then six thousand infantry, and lastly all his army, to the place already determined in his plan. It happened to be the winter season and a snowy day, in the region which lies between the Alps and the Apennine, and excessively cold by the proximity of rivers and marshes: besides, there was no heat in the bodies of the men and horses thus hastily led out without having first taken food, or employed any means to keep off the cold; and the nearer they approached to the blasts from the river, a keener degree of cold blew upon them. But when, in pursuit of the flying Numidians, they entered the water, (and it was swollen by rain in the night as high as their breasts,) then in truth the bodies of all, on landing, were so benumbed, that they were scarcely able to hold their arms; and as the day advanced they began to grow faint, both from fatigue and hunger.
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In the mean time the soldiers of Hannibal, fires having been kindled before the tents, and oil sent through the companies to soften their limbs, and their food having been taken at leisure, as soon as it was announced that the enemy had passed the river, seized their arms with vigour of mind and body, and advanced to the battle. Hannibal placed before the standards the Baliares and the light-armed troops, to the amount of nearly eight thousand men; then the heavier-armed infantry, the chief of his power and strength: on the wings he posted ten thousand horse, and on their extremities stationed the elephants divided into two parts. The consul placed on the flanks of his infantry the cavalry, recalled by the signal for retreat, as in their irregular pursuit of the enemy they were checked, while unprepared, by the Numidians suddenly turning upon them. There were of infantry eighteen thousand Romans, twenty thousand allies of the Latin name, besides the auxiliary forces of the Cenomani, the only Gallic nation that had remained faithful: with these forces they engaged the enemy. The battle was commenced by the Baliares; whom when the legions resisted with superior force, the light-armed troops were hastily drawn off to the wings; which movement caused the Roman cavalry to be immediately overpowered: for when their four thousand already with difficulty withstood by themselves ten thousand of the enemy, the wearied, against men for the most part fresh, they were overwhelmed in addition by a cloud as it were of javelins, discharged by the Baliares; and the elephants besides, which held a prominent position at the extremities of the wings, (the horses being greatly terrified not only at their appearance, but their unusual smell,) occasioned flight to a wide extent. The battle between the infantry was equal rather in courage than strength; for the Carthaginian brought the latter entire to the action, having a little before refreshed themselves, while, on the contrary, the bodies of the Romans, suffering from fasting and fatigue, and stiff with cold, were quite benumbed. They would have made a stand, however, by dint of courage, if they had only had to fight with the infantry. But both the Baliares, having beaten off the cavalry, poured darts on their flanks, and the elephants had already penetrated to the centre of the line of the infantry; while Mago and the Numidians, as soon as the army had passed their place of ambush without observing them, starting up on their rear, occasioned great disorder and alarm. Nevertheless, amid so many surrounding dangers, the line for some time remained unbroken, and, most contrary to the expectation of all, against the elephants. These the light infantry, posted for the purpose, turned back by throwing their spears; and following them up when turned, pierced them under the tail, where they received the wounds in the softest skin.