When Agathocles died in 288 BC, a large company of Italian mercenaries who had previously been held in his service found themselves suddenly without employment. Rather than leave Sicily, they seized the city of Messana. Naming themselves Mamertines (or "sons of Mars"), they became a law unto themselves, terrorizing the surrounding countryside.
The Mamertines became a growing threat to Carthage and Syracuse alike. In 265 BC, Hiero II, former general of Pyrrhus and the new tyrant of Syracuse, took action against them. Faced with a vastly superior force, the Mamertines divided into two factions, one advocating surrender to Carthage, the other preferring to seek aid from Rome. As a result, embassies were sent to both cities.
While the Roman Senate debated the best course of action, the Carthaginians eagerly agreed to send a garrison to Messana. A Carthaginian garrison was admitted to the city, and a Carthaginian fleet sailed into the Messanan harbor. However, soon afterwards they began negotiating with Hiero. Alarmed, the Mamertines sent another embassy to Rome asking them to expel the Carthaginians.
Hiero's intervention had placed Carthage's military forces directly across the narrow channel of water that separated Sicily from Italy. Moreover, the presence of the Carthaginian fleet gave them effective control over this channel, the Strait of Messina, and demonstrated a clear and present danger to nearby Rome and her interests. The Roman Senate was unable to decide on a course of action and referred the matter to the people, who voted to intervene.
The Roman attack on the Carthaginian forces at Messana triggered the first of the Punic Wars. Over the course of the next century, these three major conflicts between Rome and Carthage would determine the course of Western civilization. The wars included a Carthaginian invasion led by Hannibal, which nearly prevented the rise of the Roman Empire. Eventual victory by Rome was a turning
