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numerous army to the occupation of Lazica. The country was shut in by precipitous mountains, but level passes existed, which, however, were blocked by a dense forest. With the aid of native guides and a strong body of pioneers, a route was quickly opened; and Gubazes, the King, met and adored the Shah on his arrival. The Persians poured in rapidly and disposed themselves for an assault on Petra. At the onset they suffered severely through a ruse of the Byzantine commandant, who withdrew all his men from the battlements so as to give the fortress a deserted appearance. The Orientals, therefore, crowded up carelessly, and began to arrange their siege engines in suitable positions, when suddenly the gates were flung open, and the garrison, charging impetuously, drove them back with great slaughter. Within a few days, however, the resourceful author of this success was slain by an arrow, and thereafter the defence became languid and ineffective. Two great towers were the chief bulwarks of the town, and the Persians, without being observed, bored a tunnel which terminated under the base of one of them. Then the stone foundations were cautiously removed and substituted by a mass of inflammable wood. On fire being applied, the ponderous pile soon collapsed; whereupon the besieged gladly accepted the terms offered them to surrender. The treasures of John Tzibus—such was the name of the Duke who had been in command—which he had amassed by his extortions to a large amount, fell into the hands of the victor, who then evacuated the principality, leaving a Persian garrison in the fortress. Chosroes was now in a position to ruin Byzantine commerce in the Euxine, but it was first essential that he should build a fleet in order to make his conquest of Petra effective for the purpose. In order to guard his retreat during this expedition, the Shah had impelled an irruption of Huns into Roman