At first the war turned chiefly towards Campania. Hannibal appeared in good time to protect its capital, which he prevented from being invested; but he was unable either to wrest any of the Campanian towns held by the Romans from their strong Roman garrisons, or to prevent --in addition to a number of less important country towns--Casilinum, which secured his passage over the Volturnus, from being taken by the two consular armies after an obstinate defence. An attempt of Hannibal to gain Tarentum, with the view especially of acquiring a safe landing-place for the Macedonian army, proved unsuccessful. Meanwhile the Bruttian army of the Carthaginians under Hanno had various encounters in Lucania with the Roman army of Apulia; here Tiberius Gracchus sustained the struggle with good results, and after a successful combat not far from Beneventum, in which the slave legions pressed into service had distinguished themselves, he bestowed liberty and burgess-rights on his slave-soldiers in the name of the people. Arpi Acquired by the Romans In the following year (541) the Romans recovered the rich and important Arpi, whose citizens, after the Roman soldiers had stolen into the town, made common cause with them against the Carthaginian garrison. In general the bonds of the symmachy formed by Hannibal were relaxing; a number of the leading Capuans and several of the Bruttian towns passed over to Rome; even a Spanish division of the Phoenician army, when informed by Spanish emissaries of the course of events in their native land, passed from the Carthaginian into the Roman service. Tarentum Taken by Hannibal