With the defection of several cities to Carthage in Lucania, Bruttium, Apulia and Samnium after Cannae, Hannibal sent Mago Barca into Lucania with a detachment of troops in 216 BC to recruit troops and subjugate towns. Mago completed his mission, and when he sailed to Carthage to report to the Carthaginian senate and ask for reinforcements, Hanno was left in command of his army.
Following the defection of several cities to Carthage after Cannae, Hannibal sent Mago Barca with a troop detachment to recruit soldiers and subdue towns in Lucania, Bruttium, Apulia, and Samnium.  Mago completed his mission and reported to Carthage's senate for reinforcements. Hanno was left in command of the army.