Carthage sent more reinforcements to Sicily in 211 BCE and went on the offensive. In 211 BCE, Hannibal sent a force of Numidian cavalry to Sicily, which was led by the skilled Liby-Phoenician officer Mottones, who inflicted heavy losses on the Roman army through hit-and-run attacks. A fresh Roman army attacked the main Carthaginian stronghold on the island, Agrigentum, in 210 BCE and the city was betrayed to the Romans by a discontented Carthaginian officer. The remaining Carthaginian-controlled towns then surrendered or were taken through force or treachery and the Sicilian grain supply to Rome and its armies was resumed.