Punic Mercenaries stationed in Sardinia had rebelled in 239 BC, besieged Boaster and all Carthaginians in a citadel and later executed them after the fort fell. They managed to take over all Punic territories in Sardinia. Carthage sent a mercenary force under Hanno to retake the island in 239 BC, but this group also rebelled, killed Hanno and their Carthaginian officers and joined the rebels in Sardinia. The rebels requested Rome to take over Sardinia, which was turned down. Their heavy handedness with Sardinian natives caused native Sardinians to attack and expel the mercenaries by 237 BC. The expelled mercenaries took refuge in Italy and again requested Rome to take over Sardinia.