When Hiero returned to besiege their base (Messana) in 265 BC the Mamertines called for help from a nearby fleet from Carthage, which occupied the harbor of Messana. Seeing this, the Syracuse forces retired, not wishing to confront Carthaginian forces. Uncomfortable under the Cathaginian "protection," the Mamertines now appealed to Rome to be allowed into the protection of the Roman people. At first, the Romans did not wish to come to the aid of soldiers who had unjustly stolen a city from its rightful possessors. However, unwilling to see Carthaginian power spread further over Sicily and get too close to Italy, Rome responded by entering into an alliance with the Mamertines. In response, Syracuse allied itself with Carthage, imploring their protection. With Rome and Carthage brought into conflict, the Syracuse/Mamertine conflict escalated into the First Punic War.