The Battle of Ebro River was a naval battle fought near the mouth of Ebro River in the spring of 217 BC between a Carthaginian fleet of approximately 40 quinqueremes, under the command of Himilco, and a Roman fleet of 35 ships, under Gnaeus Cornelius Scipio Calvus. Hasdrubal Barca, the Carthaginian commander in Iberia, had launched a joint expedition to destroy the Roman base north of the Ebro River. The Carthaginian naval contingent was totally defeated after a surprise attack by the Roman ships, losing 29 ships and the control of seas around Iberia. The reputation of the Romans was further enhanced in Iberia after this victory, causing rebellion among some of the Iberian tribes under Carthaginian control. Prelude After Hanno's defeat in the Battle of Cissa in the winter of 218 BC, Gnaeus Scipio had spent his time consolidating his hold on the Iberian regions north of the Ebro and raiding the Iberian territory of Carthage south of the Ebro from his base at Tarraco. He had received no major reinforcements from Rome to augment his forces. Meanwhile, Hasdrubal Barca, the Carthaginian commander in Iberia, had raised a number of Iberian levies to expand his army substantially. The Punic naval contingent in Iberia contained 32 quinqueremes and 5 triremes in 218 BC when Hannibal had departed from Iberia. During the winter of 218 BC, Hasdrubal had added a further 10 quinqueremes to this fleet and trained additional crews to man them. In the Spring of 217 BC, Hasdrubal mounted a joint expedition towards the Roman territory north of the Ebro. Hasdrubal himself commanded the army, the exact number of which is unknown, and his deputy Himilco led the fleet. The expedition followed the coastline, with the ships beaching beside the army at night. Gnaeus Scipio, fearing that the Carthaginian army outnumbered his own, resolved to fight a naval battle; though he could only man 35 quinqueremes (25 ships were sent back to Italy after a Carthaginian raid in late 218 caused severe casualties among the crews, and some sailors may have been posted in garrisons). Battle After reaching the Ebro River, the Carthaginian fleet anchored near the estuary. The sailors and crew left their ships for foraging, as the fleet lacked transports carrying provisions. Although Hasdrubal had posted scouts to detect the activities of the Romans, Himilco had no ships out at sea scouting for Roman ships. A pair