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. Hasdrubal Barca's expedition 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 Hispania. The Scipio brothers continued with their policy of subjugating the Iberian tribes and raiding Carthaginian possessions. After losing of most of his field army, Hasdrubal had to be reinforced with the army that was to sail to Italy and reinforce Hannibal. Thus, by winning this battle, the Scipios had indirectly prevented the situation in Italy from getting worse in addition to improving their own situation in Iberia. This battle also demonstrates the danger of implementing the double envelopment tactic.
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