The Cantabri first appear in history during earlier wars in Iberia, where they served as mercenaries on various sides. In this way, in the years preceding the wars in Cantabria and Asturias, the Roman military became familiar with the warlike characteristics of the peoples of northern Hispania. There are accounts, for instance, of Cantabrians in the army of Hannibal during the Second Punic War. Additionally, there is evidence that they fought alongside the Vaccaei in 151 BC, and helped break the Roman siege of Numantia. It is also believed that there were Cantabrian troops present in the Sertorian Wars. According to Julius Caesar's testimony, there were Cantabrians at the battle of Ilerda in 49 BC.