direction of Babylon. The northernmost army gained some success, fighting in mountainous territory favorable to the Roman infantry, but the southern army was surrounded and destroyed by Ardashir's skilful horse-archers, and Alexander himself retreated after an indecisive campaign, his army wracked by indiscipline and disease. Further losses were incurred by the retreating northern army in the inclement cold of Armenia as it retired into winter quarters, due to a failure through incompetence to establish adequate supply lines. Still, Mesopotamia was retaken, and Ardashir was not thereafter able to extend his conquests, though his son, Shapur, would obtain some success later in the century. Although the Sassanids were checked for the time, the conduct of the Roman army showed an extraordinary lack of discipline. In 232, there was a mutiny in the Syrian legion, which proclaimed Taurinus emperor. Alexander managed to suppress the uprising, and Taurinus drowned while attempting to flee across the Euphrates. The emperor returned to Rome and celebrated a triumph in 233. Military discipline Alexander's reign was also characterized by a significant breakdown of military discipline. In 228, the Praetorian Guard murdered their prefect, Ulpian, in Alexander's presence. Alexander could not openly punish the ringleader of the riot, and instead removed him to a nominal post of honor in Egypt and then Crete, where he was "quietly put out of the way" sometime after the excitement had abated. The soldiers then fought a three-day battle against the populace of Rome, and this battle ended after several parts of the city were set on fire. Dio was among those who gave a highly critical account of military discipline during the time, saying that the soldiers would rather just surrender to the enemy. Different reasons are given for this issue; Campbell points to ...the decline in the prestige of the Severan dynasty, the feeble nature of Alexander himself, who appeared to be no soldier and to be completely dominated by his mother's advice, and lack of real military success at a time during which the empire was coming under increasing pressure. Herodian, on the other hand, was convinced that "the emperor's miserliness (partly the result of his mother's greed) and slowness to bestow donatives" were instrumental in the fall of military discipline under Alexander. Germanic War After the Persian war, Alexander returned to Antioch with Origen, one of the Fathers of the Christian Church. Alexander's mother, Julia Mamaea, asked for