The Battle of Dertosa, also known as the Battle of Ibera, was fought in the spring of 215 BC on the south bank of the Ebro River across from the town of Dertosa. A Roman army, under the command of Gnaeus Cornelius Scipio Calvus and Publius Cornelius Scipio defeated a similarly sized Carthaginian army under Hasdrubal Barca. The Romans, under Gnaeus Scipio, had established themselves in Hispania after winning the Battle of Cissa in 218 BC. The expedition of Hasdrubal Barca to evict them had ended in the defeat of the Iberian contingent of the Carthaginian navy at the Battle of Ebro River in 217 BC. Hasdrubal launched another expedition in 215 BC, but the defeat at Dertosa cost the Carthaginians a chance to reinforce Hannibal at a critical juncture, and the Romans gained the initiative in His