By 248 BC, the war had lasted 15 years, with many changes of fortune. It had developed into a struggle in which the Romans were attempting to decisively defeat the Carthaginians and, at a minimum, control the whole of Sicily. The Carthaginians were engaging in their traditional policy of waiting for their opponents to wear themselves out, in the expectation of then regaining some or all of their possessions and negotiating a mutually satisfactory peace treaty. Rome had gained control of most of Sicily and the Carthaginians retained only two cities on the island: Lilybaeum and Drepana; these were well-fortified and situated on the west coast, where they could be supplied and reinforced without the Romans being able to use their superior army to interfere.