But the most important condition of peace was understood rather than expressed in the treaty. Aurelian withdrew the Roman forces from Dacia, and tacitly relinquished that great province to the Goths and Vandals. His manly judgment convinced him of the solid advantages, and taught him to despise the seeming disgrace, of thus contracting the frontiers of the monarchy. The Dacian subjects, removed from those distant possessions which they were unable to cultivate or defend, added strength and populousness to the southern side of the Danube. A fertile territory, which the repetition of barbarous inroads had changed into a desert, was yielded to their industry, and a new province of Dacia still preserved the memory of Trajan’s conquests. The old country of that name detained, however, a considerable number of its inhabitants, who dreaded exile more than a Gothic master. These degenerate Romans continued to serve the empire, whose allegiance they had renounced, by introducing among their conquerors the first notions of agriculture, the useful arts, and the conveniences of civilized life. An intercourse of commerce and language was gradually established between the opposite banks of the Danube; and after Dacia became an independent state, it often proved the firmest barrier of the empire against the invasions of the savages of the North. A sense of interest attached these more settled barbarians to the alliance of Rome, and a permanent interest very frequently ripens into sincere and useful friendship. This various colony, which filled the ancient province, and was insensibly blended into one great people, still acknowledged the superior renown and authority of the Gothic tribe, and claimed the fancied honor of a Scandinavian origin. At the same time, the lucky though accidental resemblance of the name of Getæ, * infused among the credulous Goths a vain persuasion, that in a remote age, their own ancestors, already seated in the Dacian provinces, had received the instructions of Zamolxis, and checked the victorious arms of Sesostris and Darius. While the vigorous and moderate conduct of Aurelian restored the Illyrian frontier, the nation of the Alemanni violated the conditions of peace, which either Gallienus had purchased, or Claudius had imposed, and, inflamed by their impatient youth, suddenly flew to arms. Forty thousand horse appeared in the field, and the numbers of the infantry doubled those of the cavalry. The first objects of their avarice were a few cities of the Rhætian frontier; but their hopes soon rising with success, the rapid march of the Alemanni traced a line of devastation from the Danube to the Po.