The origins of the unrest among the Pannonian legions in A.D. 14 are easily discerned. The great war in Illyricum of A.D. 6–9 involved the legions in a series of extremely arduous campaigns extending across the western half of the Balkan Peninsula, in particular the impenetrable forests of Bosnia and the rugged karst of Dalmatia. The nearness of this area to Italy made the war a great crisis in the reign of Augustus: conquest of Illyricum was the keystone of Augustus' (...) northern frontier policy and no efforts were spared to achieve this. Advances in Germany could be determined from expediency but the subjugation of the Bosnian tribes was a necessity. During the war the need for men was so great that conscription was introduced in Italy and even freedmen were enlisted when ordinary citizen volunteers were not forthcoming. Cassius Dio speaks of the low morale and outbreaks of mutiny in the army of Tiberius during the last season of the war. (shrink)