The Battle of Ibera, also known as the Battle of Dertosa, was fought in the spring of 215 BC on the south bank of the Ebro River near the town of Ibera and was part of the Second Punic War. A Roman army, under the command of the brothers Gnaeus and Publius Scipio, defeated a similarly sized Carthaginian army under Hasdrubal Barca. The Romans, under Gnaeus Scipio, had invaded Iberia in late 218 BC and established a foothold after winning the Battle of Cissa. This lodgement, on the north-east Iberian coast, between the Ebro and the Pyrenees, blocked the route of any reinforcements from Iberia for the army of Hannibal, who had invaded Italy from Iberia earlier in the year. Hasdrubal attempted to evict the Romans in 217 BC, but this ended in defeat when the Carthaginian naval contingent was mauled at the Battle of Ebro River. Hasdrubal spent the rest of 217 BC and all of 216 BC subduing rebellious indigenous Iberian tribes, largely in the south. Under pressure from Carthage to reinforce Hannibal, and having been strongly reinforced, Hasdrubal marched north again in early 215 BC. Meanwhile, Scipio, who had also been reinforced, and joined by his brother Publius, had crossed the Ebro to besiege the Carthaginian-aligned town of Ibera. Hasdrubal approached and offered battle, which the Scipios accepted. Both armies were of similar sizes, about 25,000 men. When they clashed, the centre of Hasdrubal's armywhich consisted of locally recruited Iberiansfled without fighting. The Roman legions pushed through the gap, turned to each side against the remaining Carthaginian infantry and enveloped them. Both sides are reported to have suffered heavy casualties; the Carthaginians' may have been very heavy. The Carthaginian camp was sacked, but Hasdrubal escaped with most of his cavalry. The Scipio brothers continued with their policy of subjugating the Iberian tribes and raiding Carthaginian possessions. Hasdrubal lost the opportunity to reinforce Hannibal when he was at the peak of his success and an army that was ready to sail to Italy was diverted to Iberia. This effect on potential reinforcements for Hannibal has caused the historian Klaus Zimmermann to state “the Scipios' victory ... may well have been the decisive battle of the war”. Primary sources The main source for almost every aspect of the Punic Wars is the historian Polybius ( – ), a Greek sent to Rome in 167 BC as a hostage. His