We have seen that the history of Rome in her western provinces was, from an early stage of the Empire, a struggle with the Teutonic nations on the Rhine and the Danube. We have seen that all attempts at serious conquest beyond those boundaries came to nothing. ♦Roman possessions beyond those rivers.♦ The Roman possessions beyond the two great rivers were mere outposts for the better security of the land within the rivers. The district beyond them, fenced in by a wall and known as the _Agri Decumates_, was hardly more than such an outlying post on a great scale. The struggle along the border was, almost from the beginning, a defensive struggle on the part of Rome. We hear of Roman conquests from the second century to the fifth; but they are strictly defensive conquests, the mere recovery of lost possessions, or at most the establishment of fresh outposts. ♦Formation of confederacies among the Germans.♦ From the moment of the first appearance of Rome on the two rivers, the Teutonic nations were really threatening to Rome, and the warfare of Rome was really defensive; and from the very beginning too a process seems to have been at work among the German nations themselves which greatly strengthened their power as enemies of Rome. New nations or confederacies, bearing, for the most part, names unknown to earlier times, begin to be far more dangerous than the smaller and more scattered tribes of the earlier times had been. These movements among the German nations themselves, hastened by pressure of other nations to the east of them, caused the Teutonic attacks on the Empire to become more and more formidable, and at last to grow into Teutonic settlements within the Empire. But, in the course of this process, several stages may be noticed. ♦Marcomanni and Quadi.♦ Thus the _Marcomanni_ and the _Quadi_ play a part in this history from the very beginning. The Marcomanni appear in Cæsar, and, from their name of _Markmen_, we may be sure that they were a confederacy of the same kind as the later confederacies of the Franks and Alemanni. In the first and second centuries the Marcomanni are dangerous neighbours, threatening the Empire and often penetrating beyond its borders, and their name appears in history as late as the fifth century. But they play no part in the Teutonic settlements within the Empire. They do not affect the later map; they had no share in bringing about the changes out of which modern Europe arose. Their importance ceases just at the time when a second stage begins, when, in the course of the third century, we begin to hear of those nations or confederacies whose movements really did affect later history and geography. ♦Beginning of modern European history.♦