It was in this spirit that Hannibal trained his troops and led them to battle. He never made light of the difficulties that lay before him, or the dogged courage of the Romans, who rose up from every defeat with a fresh determination to be victorious. One advantage they had over Hannibal, and it could hardly be valued too highly. Though the councils of the senate who sent forth the troops might be divided, though the consuls who commanded them might be jealous of each other, yet the great mass of the army consisted of one nation, who together had fought for years under the eagles of Rome.
Hannibal, on the other hand, had to deal with soldiers of a number of different races, and his latest recruits, the Gauls, though eager and courageous, could not be depended upon in battle. When to this is added the fact that Hannibal was in a country which he did not know, among a people who feared Rome even while they hated her, and would desert him at the first sign of defeat; that he had to provide daily for the wants of both men and animals, and that for sixteen years he remained in Italy with a dwindling army, striking terror into the hearts of the bravest of the Romans, you may have some little idea of the sort of man he was.
Well may an historian say that the second Punic war was the struggle of a great man against a great nation. Take away Hannibal, and the Carthaginian forces were at the mercy of Rome.
We have no space to describe the various battles in the valley of the Po, in which Hannibal was always the victor. At the river Trebia he defeated Scipio in December 218, by aid of the strategy which never failed, till he taught his enemies how to employ it against himself. Hannibal was a man who never left anything to chance, and whether his generals were trusted to draw the enemy from a strong position into the open field, or to decoy it into an ambuscade, everything was foreseen, and as far as possible provided against. He took care that his troops and his animals should go into action fresh, well-fed, and well-armed, and more than once had the wounds of both horses and men washed with old wine after a battle. That tired soldiers cannot fight was a truth he never forgot or neglected.
During the winter months following the victory of Trebia, Hannibal pitched his camp in the territories of his Gallic allies, and busied himself with making friendly advances to the Italian cities which had been forced to acknowledge the headship of Rome. 'He had not come to fight against them,' he said, 'but against Rome, on their behalf.' So the Italian prisoners were set free without ransom, while the Roman captives were kept in close confinement. He also sent out spies to collect all the information they could as to the country through which he had to travel. He was anxious, for other reasons, to break up his camp as soon as he was able, as he saw signs that the Gauls were weary and rather afraid of having him for a neighbour.
Therefore, in the spring of 217 b.c. he marched southwards, placing the Spaniards and Libyans in front, with the baggage and stores behind them, the Gauls, whom he never quite trusted, in the centre, and the Numidian light horse and cavalry in the rear, under his brother Mago. There were no elephants to be thought of now, for they had all died of cold after the battle of Trebia. North of the Arno was a wide tract of marshland, which had to be crossed before the Apennine mountains could be reached. Never, during all his campaigns, did Hannibal's army have to undergo such suffering. In many ways it was worse than the passage of the Alps, for once in the midst of the morasses, swollen by the melting snows, it was hardly possible to snatch a moment of sleep. Many of the oxen fell and died, and when this happened the wearied men stretched themselves on their still warm bodies, and closed their eyes for a short space.
At length, after three nights and four days of incessant marching, till the troops were nearly numb with cold, firm ground was reached, and for a while they rested in peace on the hill of Fiesole, above the Arno.
Here Hannibal formed his plans for the next campaign. He found out that Flaminius the consul was a vain, self-confident man, with neither experience nor skill in war. It would be easy, he thought, by laying waste the rich country to the south, to draw the Roman general from his camp at Arretium; and so it proved. Flaminius, greedy of glory he could never gain, refused to listen to the advice of his officers and wait for the arrival of the other consul, and set out in pursuit of Hannibal, who felt that victory was once more in his hands.