He took a great many towns and fortresses, either through treachery or by battle, and thoughtlessly proceeded onwards, without reflecting that he would have to return by the same route. He pillaged every place he approached, and pulled down or burnt the granaries and storehouses. As he was journeying up the Euphrates, he arrived at Ctesiphon, a very large city, whither the Persian monarchs have now transferred their residence from Babylon. The Tigris flows near this spot. As he was prevented from reaching the city with his ships, by a part of the land which separated it from the river, he judged that either he must pursue his journey by water, or quit his ships and go to Ctesiphon by land; and he interrogated the prisoners on the subject. Having ascertained from them that there was a canal which had been blocked up in the course of time, he caused it to be cleared out, and, having thus effected a communication between the Euphrates and the Tigris, he proceeded towards the city, his ships floating along by the side of his army. But the Persians appeared on the banks of the Tigris with a formidable display of horse and many armed troops, of elephants, and of horses; and Julian became conscious that his army was besieged between two great rivers, and was in danger of perishing, either by remaining in its present position, or by retreating through the cities and villages which he had so utterly devastated that no provisions were attainable; therefore he summoned the soldiers to see horse-races, and proposed rewards to the fleetest racers. In the meantime he commanded the officers of the ships to throw over the provisions and baggage of the army, so that the soldiers, seeing themselves in danger by the want of necessaries, might turn about boldly and fight their enemies more desperately. After supper he sent for the generals and tribunes and commanded the embarkation of the troops. They sailed along the Tigris during the night and came at once to the opposite banks and disembarked; but their departure was perceived by some of the Persians, who exhorted one another to oppose them, but those still asleep the Romans readily overcame.