37 ([return])
[ Feralis umbra, is the expression of Tacitus: it is surely a very bold one.]
38 ([return])
[ Tacit. Germania, (c. 43.)]
39 ([return])
[ Vopiscus in Hist. August. p. 238]
Since the expedition of Maximin, the Roman generals had confined their ambition to a defensive war against the nations of Germany, who perpetually pressed on the frontiers of the empire. The more daring Probus pursued his Gallic victories, passed the Rhine, and displayed his invincible eagles on the banks of the Elbe and the Neckar. He was fully convinced that nothing could reconcile the minds of the barbarians to peace, unless they experienced, in their own country, the calamities of war. Germany, exhausted by the ill success of the last emigration, was astonished by his presence. Nine of the most considerable princes repaired to his camp, and fell prostrate at his feet. Such a treaty was humbly received by the Germans, as it pleased the conqueror to dictate. He exacted a strict restitution of the effects and captives which they had carried away from the provinces; and obliged their own magistrates to punish the more obstinate robbers who presumed to detain any part of the spoil. A considerable tribute of corn, cattle, and horses, the only wealth of barbarians, was reserved for the use of the garrisons which Probus established on the limits of their territory. He even entertained some thoughts of compelling the Germans to relinquish the exercise of arms, and to trust their differences to the justice, their safety to the power, of Rome. To accomplish these salutary ends, the constant residence of an Imperial governor, supported by a numerous army, was indispensably requisite. Probus therefore judged it more expedient to defer the execution of so great a design; which was indeed rather of specious than solid utility. [40] Had Germany been reduced into the state of a province, the Romans, with immense labor and expense, would have acquired only a more extensive boundary to defend against the fiercer and more active barbarians of Scythia.
40 ([return])
[ Hist. August. 238, 239. Vopiscus quotes a letter from the emperor to the senate, in which he mentions his design of reducing Germany into a province.]
Instead of reducing the warlike natives of Germany to the condition of subjects, Probus contented himself with the humble expedient of raising a bulwark against their inroads. The country which now forms the circle of Swabia had been left desert in the age of Augustus by the emigration of its ancient inhabitants. [41] The fertility of the soil soon attracted a new colony from the adjacent provinces of Gaul. Crowds of adventurers, of a roving temper and of desperate fortunes, occupied the doubtful possession, and acknowledged, by the payment of tithes, the majesty of the empire. [42] To protect these new subjects, a line of frontier garrisons was gradually extended from the Rhine to the Danube. About the reign of Hadrian, when that mode of defence began to be practised, these garrisons were connected and covered by a strong intrenchment of trees and palisades. In the place of so rude a bulwark, the emperor Probus constructed a stone wall of a considerable height, and strengthened it by towers at convenient distances. From the neighborhood of Neustadt and Ratisbon on the Danube, it stretched across hills, valleys, rivers, and morasses, as far as Wimpfen on the Neckar, and at length terminated on the banks of the Rhine, after a winding course of near two hundred miles. [43] This important barrier, uniting the two mighty streams that protected the provinces of Europe, seemed to fill up the vacant space through which the barbarians, and particularly the Alemanni, could penetrate with the greatest facility into the heart of the empire. But the experience of the world, from China to Britain, has exposed the vain attempt of fortifying any extensive tract of country. [44] An active enemy, who can select and vary his points of attack, must, in the end, discover some feeble spot, or some unguarded moment. The strength, as well as the attention, of the defenders is divided; and such are the blind effects of terror on the firmest troops, that a line broken in a single place is almost instantly deserted. The fate of the wall which Probus erected may confirm the general observation. Within a few years after his death, it was overthrown by the Alemanni. Its scattered ruins, universally ascribed to the power of the Dæmon, now serve only to excite the wonder of the Swabian peasant.