During the reign of Augustus, Germanicus enjoyed an accelerated political career as the heir of the emperor's heir, entering the office of quaestor five years before the legal age in AD 7. He held that office until AD 11, and was elected consul for the first time in AD 12. The year after, he was made proconsul of Germania Inferior, Germania Superior, and all of Gaul. From there he commanded eight legions, about one-third of the entire Roman army, which he led against the Germanic tribes in his campaigns from AD 14 to 16. He avenged the Roman Empire's defeat in the Teutoburg Forest and retrieved two of the three legionary eagles that had been lost during the battle. In AD 17 he returned to Rome where he received a triumph before leaving to reorganise the provinces of Asia Minor, whereby he incorporated the provinces of Cappadocia and Commagene in AD 18.