The History of the Decline and Fall of the Roman Empire - Edward Gibbon [721]
[Footnote 81: One of these dikes, which produces an artificial cascade or cataract, is described by Tavernier (part i. l. ii. p. 226) and Thevenot, (part ii. l. i. p. 193.) The Persians, or Assyrians, labored to interrupt the navigation of the river, (Strabo, l. xv. p. 1075. D'Anville, l'Euphrate et le Tigre, p. 98, 99.)]
[Footnote 82: Recollect the successful and applauded rashness of Agathocles and Cortez, who burnt their ships on the coast of Africa and Mexico.]
The cumbersome train of artillery and wagons, which retards the operations of a modern army, were in a great measure unknown in the camps of the Romans. ^83 Yet, in every age, the subsistence of sixty thousand men must have been one of the most important cares of a prudent general; and that subsistence could only be drawn from his own or from the enemy's country. Had it been possible for Julian to maintain a bridge of communication on the Tigris, and to preserve the conquered places of Assyria, a desolated province could not afford any large or regular supplies, in a season of the year when the lands were covered by the inundation of the Euphrates, ^84 and the unwholesome air was darkened with swarms of innumerable insects. ^85 The appearance of the hostile country was far more inviting. The extensive region that lies between the River Tigris and the mountains of Media, was filled with villages and towns; and the fertile soil, for the most part, was in a very improved state of cultivation. Julian might expect, that a conqueror, who possessed the two forcible instruments of persuasion, steel and gold, would easily procure a plentiful subsistence from the fears or avarice of the natives. But, on the approach of the Romans, the rich and smiling prospect was instantly blasted. Wherever they moved, the inhabitants deserted the open villages, and took shelter in the fortified towns; the cattle was driven away; the grass and ripe corn were consumed with fire; and, as soon as the flames had subsided which interrupted the march of Julian, he beheld the melancholy face of a smoking and naked desert. This desperate but effectual method of defence can only be executed by the enthusiasm of a people who prefer their independence to their property; or by the rigor of an arbitrary government, which consults the public safety without submitting to their inclinations the liberty of choice. On the present occasion the zeal and obedience of the Persians seconded the commands of Sapor; and the emperor was soon reduced to the scanty stock of provisions, which continually wasted in his hands. Before they were entirely consumed, he might still have reached the wealthy and unwarlike cities of Ecbatana or Susa, by the effort of a rapid and well-directed march; ^86 but he was deprived of this last resource by his ignorance of the roads, and by the perfidy of his guides. The Romans wandered several days in the country to the eastward of Bagdad; the Persian deserter, who had artfully led them into the spare, escaped from their resentment; and his followers, as soon as they were put to the torture, confessed the secret of the conspiracy. The visionary conquests of Hyrcania and India, which had so long amused, now tormented, the mind of Julian. Conscious that his own imprudence was the cause of the public distress, he anxiously balanced the hopes of safety or success, without obtaining a satisfactory answer, either from gods or men. At length, as the only practicable measure, he embraced the resolution of directing his steps towards the banks of the Tigris, with the design of saving the army by a hasty march to the confines of Corduene; a fertile and friendly province, which acknowledged the sovereignty of Rome. The desponding troops obeyed the signal of the retreat, only seventy days after they had passed the Chaboras, with the sanguine expectation of subverting the throne of Persia. ^87
[Footnote 83: See the judicious reflections of the author of the Essai sur la Tactique, tom. ii. p. 287-353, and the learned remarks of M. Guichardt Nouveaux Memoires Militaires, tom. i. p.