Having in this way effected the passage, Julian continued his march along the Euphrates, and in a short time came to the city of Perisabor (Mruz Shapur), the most important that he had yet reached, and reckoned not much inferior to Otesiphon. As the inhabitants steadily refused all accommodation, and insulted Hormisdas, who was sent to treat with them, by the reproach that he was a deserter and a traitor, the emperor determined to form the siege of the place and see if he could not compel it to a surrender. Situated between the Euphrates and one of the numerous canals derived from it, and further protected by a trench drawn across from the canal to the river, Perisabor occupied a sort of island, while at the same time it was completely surrounded with a double wall. The citadel, which lay towards the north, and overhung the Euphrates, was especially strong; and the garrison was brave, numerous, and full of confidence. The walls, however, composed in part of brick laid in bitumen, were not of much strength; and the Roman soldiers found little difficulty in shattering with the ram one of the corner towers, and so making an entrance into the place. But the real struggle now began. The brave defenders retreated into the citadel, which was of imposing height, and from this vantage-ground galled the Romans in the town with an incessant shower of arrows, darts, and stones. The ordinary catapults and balistae of the Romans were no match for such a storm descending from such a height; and it was plainly necessary, if the place was to be taken, to have recourse to some other device. Julian, therefore, who was never sparing of his own person, took the resolution, on the second day of the siege, of attempting to burst open one of the gates. Accompanied by a small band, who formed a roof over his head with their shields, and by a few sappers with their tools, he approached the gate-tower, and made his men commence their operations. The doors, however, were found to be protected with iron, and the fastenings to be so strong that no immediate impression could be made; while the alarmed garrison, concentrating its attention on the threatened spot, kept up a furious discharge of missiles on their daring assailants. Prudence counselled retreat from the dangerous position which had been taken up; and the emperor, though he felt acutely the shame of having failed, retired. But his mind, fertile in resource, soon formed a new plan. He remembered that Demetrius Poliorcetes had acquired his surname by the invention and use of the “Helepolis,” a movable tower of vast height, which placed the assailants on a level with the defenders even of the loftiest ramparts. He at once ordered the construction of such a machine; and, the ability of his engineers being equal to the task, it rapidly grew before his eyes. The garrison saw its growth with feelings very opposite to those of their assailant; they felt that they could not resist the new