Besides, Hannibal had never expected to surprise Rome by a -coup de main-, such as Scipio soon afterwards executed against New Carthage, and still less had he meditated a siege in earnest; his only hope was that in the first alarm part of the besieging army of Capua would march to Rome and thus give him an opportunity of breaking up the blockade.
Accordingly after a brief stay he departed.

The Romans saw in his withdrawal a miraculous intervention of the gods, who by portents and visions had compelled the wicked man to depart, when in truth the Roman legions were unable to compel him; at the spot where Hannibal had approached nearest to the city, at the second milestone on the Appian Way in front of the Capene gate, with grateful credulity the Romans erected an altar to the god "who turned back and protected" (-Rediculus Tutanus-), Hannibal in reality retreated, because this was part of his plan, and directed his march towards Capua.

But the Roman generals had not committed the mistake on which their opponent had reckoned; the legions remained unmoved in the lines round Capua, and only a weak corps had been detached on the news of Hannibal's march towards Rome.

When Hannibal learned this, he suddenly turned against the consul Publius Galba, who had imprudently followed him from Rome, and with whom he had hitherto avoided an engagement, vanquished him, and took his camp by storm.
Capua Capitulates But this was a poor compensation for the now inevitable fall of Capua.
Long had its citizens, particularly the better passes, anticipated with sorrowful forebodings what was coming; the senate-house and the administration of the city were left almost exclusively to the leaders of the popular party hostile to Rome.

Now despair seized high and low, Campanians and Phoenicians alike.