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588-590] Maurice's only course was to reappoint Philippicus to the supreme command in the East, but the army, which had elected its own officers, was not to be thus easily pacified: the troops solemnly swore that they would never receive the nominee of an emperor whom they no longer acknowledged. Meanwhile, as was but natural, Persia seized her opportunity and invested Constantina, but Germanus prevailed upon his men to take action and the city was relieved. The soldiers' resentment was lessened by the skilful diplomacy of Aristobulus, who brought gifts from Constantinople, and Germanus was able to invade Persia with a force of 4000 men. Though checked by Marouzas, he retired in safety to the Nymphius, and at Martyropolis Marouzas was defeated and killed by the united Roman forces: three thousand captives were taken, among them many prominent Persians, while the spoils and standards were sent to Maurice. This was the signal that the army was once more prepared to acknowledge the Emperor, and all would have been well had not Maurice felt it necessary to insist that Philippicus should again be accepted by the troops as their general. This however they refused to do, even when Andreas, captain of the imperial shield-bearers, was sent to them; and only after a year's cessation of hostilities (588-589) was the army, through the personal influence of Gregory, bishop of Antioch, persuaded to obey its former commander (Easter 590). Philippicus did not long enjoy his triumph. About this time Martyropolis fell by treachery into Persian hands, and with the spring of 590 the Roman forces marched into Armenia to recover the city. When he failed in this Philippicus was superseded by Comentiolus, and although the latter was unsuccessful, Heraclius won a brilliant victory and captured the enemy's camp.

It is at first sight somewhat surprising that the Persians had remained inactive during the year 589, but we know that they were fully engaged with internal difficulties. The violence of Ormizd had, it seems, caused a dangerous revolt in Kusistan and Kerman, and in face of this peril Persia accepted an offer of help from the Turks. Once admitted into Khorasan, Schaweh Schah disregarded his promises and advanced southwards in the direction of the capital, but was met by Bahram Cobin, the governor of Media, and was defeated in the mountains of Ghilan. The power of the Turks was broken: they could no longer exact, but were bound to pay, an annual tribute. After this signal success Bahram Cobin undertook an invasion of Roman territory in the Caucasus district; the Persians encountered no resistance, for the imperial forces were concentrated in Armenia. Maurice sent Romanus to engage the enemy in Albania, and in the valley of one of the streams flowing into the Araxes Bahram was so severely worsted that he was in consequence removed from his command by Ormizd. Thus disgraced he determined to seize the