The whole four thousand climbed the ridge.
A howl of rage rang through Rome at the news that they had once more been outwitted, and all Fabius' wise generalship was forgotten in this fresh defeat. Yet, had they stopped to think, the fault did not lie with the dictator, whose plans had been well laid, but with the commander of the troops in the pass, who, instead of sending out scouts to find out the cause of the disturbance on the ridge, moved his whole body of men, leaving the defile unguarded. Perhaps Hannibal, in arranging the surprise, had known something of the commander and what to expect of him; or he may merely have counted—as he had often done before—on the effects of curiosity. But time after time he traded on the weakness of man, and always succeeded.
It was in June 216 b.c. that Hannibal gained his last great battle in Italy. He had remained for many months near the river Ofanto, which runs into the Adriatic, but in the beginning of summer he threw himself into the town of Cannæ, used by the Romans as a storehouse for that part of Italy.
A Roman army of ninety thousand men amply supplied was coming swiftly to meet him along the splendid roads, and he had only fifty thousand to cope with them, the greater number being Gauls, and not to be depended on. Of the original troops that he had brought from Spain, many were dead, but he was able to muster ten thousand cavalry, mostly consisting of the Numidian horse, and in this respect he was superior to the Romans. There was also to be reckoned to his advantage the fact that the two consuls, Varro and Paulus, hated each other bitterly, and that neither of them had any instinct of command, though Paulus was a capable soldier and a brave man.
There was a custom among the Romans, dating back from ancient days, that when the two consuls were serving on the same campaign, each should command on alternate days. It seems strange that such a very practical nation should have made such a foolish law, but so it was; and on this occasion it once more led, as it was bound to do, to an utter defeat. Hannibal played his usual game of sending Numidians across the river to insult and tease his enemy, till at length Varro exclaimed in wrath that the next day the command would be his, and that he would give the Carthaginians battle and teach them something of the majesty of Rome.
In vain the wiser Paulus, who had followed the counsels of Fabius, reasoned and protested. Varro would listen to nothing, and orders were given to the army to be ready on the morrow for the attack.
The day before the battle Hannibal spent 'in putting the bodies of his troops into a fit state to fight,' as the historian tells us—that is, he made them rest and sleep, and prepare plenty of food for their breakfast. Early next morning the Romans began to cross the river, which took several hours, thus leaving their strong camp on the southern bank with only a small force to defend it, and took up their position in the plains, where Hannibal's cavalry had ample room to manœuvre. And, to make matters worse, the consul formed his men into such close columns that they could not avoid being hampered by each other's movements.