 Complete the following phrase:  In 260 BC the Romans built a large fleet and over the following ten years defeated the Carthaginians in a succession of naval battles. The Romans also slowly gained control of most of Sicily, including the major cities of Akragas modern Agrigento; Agrigentum in Latin; captured in 262 BC and Panormus modern Palermo; captured in 254 BC. By 250 BC the war had lasted 14 years, fortunes changing many times. It had developed into a struggle in which the Romans were attempting to defeat the Carthaginians decisively 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, as they had done several times during the 