 Lusitania was probably the area of the peninsula that resisted the Roman invasion for the longest time.Until the year 155 BC, the Lusitanian chief Punicus made raids into the part of Lusitania controlled by Rome, ending with the twenty-year peace made by the former praetor Sempronius Gracchus.Punicus obtained an important victory against the praetors Manilius and Calpurnius, inflicting 6,000 casualties.