Variance between Rome and Carthage
Carthaginians in Messana
Messana Seized by the Romans
War between the Romans and the Carthaginians and the Syracusans

Much depended on the way in which the two Sicilian powers, immediately affected by this intervention of the Romans in the affairs of the island, and both hitherto nominally in alliance with Rome, would regard her interference.  Hiero had sufficient reason to treat the summons, by which the Romans required him to desist from hostilities against their new confederates in Messana, precisely in the same way as the Samnites and Lucanians in similar circumstances had received the occupation of Capua and Thurii, and to answer the Romans by a declaration of war.  If, however, he remained unsupported, such a war would be folly; and it might be expected from his prudent and moderate policy that he would acquiesce in what was inevitable, if Carthage should be disposed for peace.  This seemed not impossible.  A Roman embassy was now (489) sent to Carthage, seven years after the attempt of the Phoenician fleet to gain possession of Tarentum, to demand explanations as to these incidents.(4) Grievances not unfounded, but half-forgotten, once more emerged—­it seemed not superfluous amidst other warlike preparations to replenish the diplomatic armoury with reasons for war, and for the coming manifesto to reserve to themselves, as was the custom of the Romans, the character of the party aggrieved.  This much at least might with entire justice be affirmed, that the respective enterprises on Tarentum and Messana stood upon exactly the same footing in point of design and of pretext, and that it was simply the accident of success that made the difference.  Carthage avoided an open rupture.  The ambassadors carried back to Rome the disavowal of the Carthaginian admiral who had made the attempt on Tarentum, along with the requisite false oaths:  the counter-complaints, which of course were not wanting on the part of Carthage, were studiously moderate, and abstained from characterizing the meditated invasion of Sicily as a ground for war.  Such, however, it was; for Carthage regarded the affairs of Sicily —­just as Rome regarded those of Italy—­as internal matters in which an independent power could allow no interference, and was determined to act accordingly.  But Phoenician policy followed a gentler course than that of threatening open war.  When the preparations of Rome for sending help to the Mamertines were at length so far advanced that the fleet formed of the war-vessels of Naples, Tarentum, Velia, and Locri, and the vanguard of the Roman land army under the military tribune Gaius Claudius, had appeared at Rhegium (in the spring of 490), unexpected news arrived from Messana that the Carthaginians, having come to an understanding with the anti-Roman party there, had as a neutral power arranged a peace between Hiero and the Mamertines; that the siege had in consequence been raised; and