Hannibal received them, but he was too sagacious to admit such a treacherous horde into his army. He treated them with great consideration and kindness, and dismissed them with presents, that they might all go to their respective homes, charging them to exert their influence in his favor among the tribes to which they severally belonged.
Hannibal's soldiers, too, were very much encouraged by the commencement they had made. The army made immediate preparations for crossing the river. Some of the soldiers built rafts, others went up the stream in search of places to ford. Some swam across. They could adopt these or any other modes in safety, for the Romans made no stand on the opposite bank to oppose them, but moved rapidly on, as fast as Scipio could be carried. His wounds began to inflame, and were extremely painful.
In fact, the Romans were dismayed at the danger which now threatened them. As soon as news of these events reached the city, the authorities there sent a dispatch immediately to Sicily to recall the other consul. His name was Sempronius. It will be recollected that, when the lots were cast between him and Scipio, it fell to Scipio to proceed to Spain, with a view to arresting Hannibal's march, while Sempronius went to Sicily and Africa. The object of this movement was to threaten and attack the Carthaginians at home, in order to distract their attention and prevent their sending any fresh forces to aid Hannibal, and, perhaps, even to compel them to recall him from Italy to defend their own capital. But now that Hannibal had not only passed the Alps, but had also crossed the Po, and was marching toward Rome-Scipio himself disabled, and his army flying before him-they were obliged at once to abandon the plan of threatening Carthage. They sent with all dispatch an order to Sempronius to hasten home and assist in the defense of Rome.
Sempronius was a man of a very prompt and impetuous character, with great confidence in his own powers, and very ready for action. He came immediately into Italy, recruited new soldiers for the army, put himself at the head of his forces, and marched northward to join Scipio in the valley of the Po. Scipio was suffering great pain from his wounds, and could do but little toward directing the operations of the army. He had slowly retreated before Hannibal, the fever and pain of his wounds being greatly exasperated by the motion of traveling. In this manner he arrived at the Trebia, a small stream flowing northward into the Po. He crossed this stream, and finding that he could not go any further, on account of the torturing pain to which it put him to be moved, he halted his army, marked out an encampment, threw up fortifications around it, and prepared to make a stand. To his great relief, Sempronius soon came up and joined him here.
There were now two generals. Napoleon used to say that one bad commander was better than two good ones, so essential is it to success in all military operations to secure that promptness, and confidence, and decision which can only exist where action is directed by one single mind. Sempronius and Scipio disagreed as to the proper course to be pursued. Sempronius wished to attack Hannibal immediately. Scipio was in favor of delay. Sempronius attributed Scipio's reluctance to give battle to the dejection of mind and discouragement produced by his wound, or to a feeling of envy lest he, Sempronius, should have the honor of conquering the Carthaginians, while he himself was helpless in his tent. On the other hand, Scipio thought Sempronius inconsiderate and reckless, and disposed to rush heedlessly into a contest with a foe whose powers and resources he did not understand.
In the mean time, while the two commanders were thus divided in opinion, some skirmishes and small engagements took place between detachments from the two armies, in which Sempronius thought that the Romans had the advantage. This excited his enthusiasm more and more, and he became extremely desirous to bring on a general battle. He began to be quite out of patience with Scipio's caution and delay. The soldiers, he said, were full of strength and courage, all eager for the combat, and it was absurd to hold them back on account of the feebleness of one sick man. "Besides," said he, "of what use can it be to delay any longer? We are as ready to meet the Carthaginians now as we shall ever be. There is no third consul to come and help us; and what a disgrace it is for us Romans, who in the former war led our troops to the very gates of Carthage, to allow Hannibal to bear sway over all the north of Italy, while we retreat gradually before him, afraid to encounter now a force that we have always conquered before."
Hannibal was not long in learning, through his spies, that there was this difference of opinion between the Roman generals, and that Sempronius was full of a presumptuous sort of ardor, and he began to think that he could contrive some plan to draw the latter out into battle under circumstances in which he would have to act at a great disadvantage. He did contrive such a plan. It succeeded admirably; and the case was one of those numerous instances which occurred in the history of Hannibal, of successful stratagem, which led the Romans to say that his leading traits of character were treachery and cunning.
Hannibal's plan was, in a word, an attempt to draw the Roman army out of its encampment on a dark, cold, and stormy night in December, and get them into the river. This river was the Trebia. It flowed north into the Po, between the Roman and Carthaginian camps. His scheme, in detail, was to send a part of his army over the river to attack the Romans in the night or very early in the morning. He hoped that by this means Sempronius would be induced to come out of his camp to attack the Carthaginians. The Carthaginians were then to fly and recross the river, and Hannibal hoped that Sempronius would follow, excited by the ardor of pursuit. Hannibal was then to have a strong reserve of the army, that had remained all the time in warmth and safety, to come out and attack the Romans with unimpaired strength and vigor, while the Romans themselves would be benumbed by the cold and wet, and disorganized by the confusion produced in crossing the stream.
A part of Hannibal's reserve were to be placed in an ambuscade. There were some meadows near the water, which were covered in many places with tall grass and bushes. Hannibal went to examine the spot, and found that this shrubbery was high enough for even horsemen to be concealed in it. He determined to place a thousand foot soldiers and a thousand horsemen here, the most efficient and courageous in the army. He selected them in the following manner:
He called one of his lieutenant generals to the spot, explained somewhat of his design to him, and then asked him to go and choose from the cavalry and the infantry, a hundred each, the best soldiers he could find. This two hundred were then assembled, and Hannibal, after surveying them with looks of approbation and pleasure, said, "Yes, you are the men I want, only, instead of two hundred, I need two thousand. Go back to the army, and select and bring to me, each of you, nine men like yourselves." It is easy to be imagined that the soldiers were pleased with this commission, and that they executed it faithfully. The whole force thus chosen was soon assembled, and stationed in the thickets above described, where they lay in ambush ready to attack the Romans after they should pass the river.