This city was for some time assailed by Julian[206], who fixed his camp near the ruins of Seleucia, and secured himself by a ditch and rampart, against the sallies and enterprising garrison of Coche. In this fruitful and pleasant country the Romans were supplied with water and forage; and several forts, which might have embarrassed the motions of the army, submitted, after some resistance, to the efforts of their valour. The fleet passed from the Euphrates in an artificial diversion of the river, which forms a copious and navigable stream into the Tigris, at a small distance _below_ the great city. Had they followed this royal canal, which bore the name of Nahar-Malcha[207], the immediate situation of Coche would have separated the fleet and army of Julian; and the vast attempt of steering against the current of the Tigris, and forcing their way through the midst of a hostile capital, must have been attended with the total destruction of the Roman army. As Julian had minutely studied the operations of Trajan in the same country, he soon recollected that his warlike predecessor had dug a new and navigable canal, which conveyed the waters into the Tigris, at some distance above the river. From the information of the peasants, Julian ascertained the vestiges of this ancient work, which were almost obliterated by design or accident. He, therefore, prepared a deep channel for the reception of the Euphrates: the flood of waters rushed into this new bed; and the Roman fleet steered their triumphant course into the Tigris. He soon after passed, with his whole army, over the river: sending up a military shout, the Romans advanced in measured steps, to the animating notes of military music; launched their javelins, and rushed forwards with drawn swords, to deprive the barbarians, by a closer onset, of the advantage of their missile weapons. The action lasted twelve hours: the enemy at last gave way. They were pursued to the gates of Ctesiphon, and the conquerors, says the historian from whom we have borrowed this account, might have entered the dismayed city, had not their general desired them to desist from the attempt; since, if it did not prove successful, it must prove fatal. The spoil was ample: large quantities of gold and silver, splendid arms and trappings, and beds, and tables of massy silver. The victor distributed, as the reward of valour, some honourable gifts civic and mural, and naval crowns: and then considered what new measures to pursue: for, as we have already stated, his troops had not ventured to attempt entering the city. He called a council of war; but seeing that the town was strongly defended by the river, lofty walls[208], and impassable morasses, he came to the determination of not besieging it; holding it a fruitless and pernicious undertaking. This occurred A.D. 363. In this city Chosroes, king of Persia, built a palace; supposed to have been once the most magnificent structure in the East.