Second Punic War in 217. Moving to southern Italy in 216, Hannibal at Cannae annihilated the largest army the Romans had ever assembled. After the death or imprisonment of 130,000 Roman troops in two years, 40% of Rome's Italian allies defected to Carthage, giving her control over most of southern Italy. Macedon and Syracuse joined the Carthaginian side after Cannae and the conflict spread to Greece and Sicily. From 215–210 the Carthaginian army and navy launched repeated amphibious assaults to capture Roman Sicily and Sardinia but were ultimately repulsed. Against Hannibal's skill on the battlefield, the Romans adopted the Fabian strategy – the
Battle of Utica (203 BC) and the reconquest of the parts of Sicily that had been temporarily lost after the battle of Cannae, the Romans secured a base for a naval assault on Carthage. They made use of that by carrying out a number of raids on African soil in 208, 207 and 205 BC. Since 206 BC, when Scipio Africanus finally expelled the Carthaginians from Iberia (see the battle of Ilipa), he was preoccupied with the idea that Africa should be the next target. To this end, he concluded an alliance with Syphax – one of the most powerful Numidian rulers at the time