The siege of Aracillum was a siege of the Cantabrian Wars that occurred in 25 BC. The battle took place between the forces of the Roman Empire, which consisted of five Roman legions commanded by Gaius Antistius Vetus and the forces of the Cantabri people, who had fortified the hill fort at Aracillum. The battle resulted in a Roman victory. Traditionally identified as (Campoo de Enmedio), there has never been any concrete discovery of the actual location of the battle.