There were two ways to Europe for the Indo-Germanic tribes,—south and north of the Black Sea. First the Hellenic and Italic tribes came over the sea and settled in the two countries lying near them and connected by islands, which form the southeastern limits of one continent—Greece and Italy.[71] The peoples in these beautiful countries quickly attained to a wonderful state of civilisation, isolated for more than a thousand years from northern Europe. This was the period of classical antiquity which, for its art and literature, its statecraft and military system, unrivalled almost up to the present day, has become the best school of later mankind.

The second way from Asia to Europe lay north of the Pontus, and was far longer and more fraught with weariness and danger than the first; thus it was all the more adapted to the strengthening both of body and spirit. At the northwest corner of the Black Sea it divided into a south and a north road. Along the former, by the Danube between the Alps and the Carpathians, the Celts migrated; later, along the second, north of the Carpathians, the Germanic tribes entered western Europe, and were soon followed by the Slavonic. Rome was already at the height of its empire over the world when the first conflict took place between the Romans and the Germanic tribes. The contact of the two races was of course that of a rude primitive people with the members of a civilised state. Rome at first tried the system of gradual repulse by the attack and subjection of the Germans. When this policy was defeated by the battle fought by Varus, she adopted the system of frontier protection, which lasted nearly two centuries.

But the destinies of the future were being prepared in another way. The remarkable aptitude for civilisation of the Germanic races made them early recognise the value of that of Rome. Young nobles were educated in the capital of the empire and trained in the army; the actual commercial interests, the servitude of the one race in the countries of the other, brought about a mutual relation whose most powerful lever was the Roman military service, which thousands of Germans joined, satisfying in that way their thirst for war and glory as well as their desire for monetary gains.

Thus Rome itself trained the officers and military leaders of its subsequent foes and final destroyers, from whom it had already seriously suffered in the revolt of Civilis. The first act of the “barbarian advance” opened with the war which we call the Marcomannic.

Towards the beginning of the last half of the second century the tribes living between the Pregel, Vistula, and Baltic—now East and West Prussia—left their unfavoured home to seek a better one in the proximity of the Roman frontiers. It was the great Gothic family which made this first migration, in which it carried along with it other allied races, as the Vandals and Burgundiones. The mass separated; the chief tribe, the Goths, went towards the Black Sea between the Don and the Dnieper, where they only arrived after a long time on account of the long distance and of the necessity of fighting their way.

The secondary tribes went up the Vistula through the Carpathians to the Danube. Beyond this stream, in the year 165, one of the unceasing wars between the Marcomanni and the Romans was in progress. The pressure of the new rovers from the north gave fresh weight and importance to the pressure of the Danubian Germans. The Marcomannic War lasted nearly fifteen years; its course was terrible, and similar to that of the Punic War.

Marcus Aurelius, however, was greater than the danger; he became its master. Not a foot of Roman territory was lost; on the contrary, many thousand homeless Germans settled in the empire as new brave subjects. There was now for half a century an apparent cessation of the process of destruction, but only of its external manifestations, not of the internal efforts and preparations towards this end. The Roman tithe province (agri decumates) between the Rhine and the Danube, unprotected by any natural boundaries, was the first field of Germanic occupation. At what date the chief mass of Vandals and Burgundiones, together with the Lygii, migrated from their settlements between the Oder and the Vistula to the Roman frontiers, we have no knowledge. We first encounter them under Probus in the year 277, acting in the rear of the older frontier tribes as their allies.

For over half a century, from 211 to 268, Rome had no great emperor; indeed, with the exception of Maximinus, 235-238, not even a warrior. He, however, was a rude barbarian who knew only how to fight and to conquer, not how to organise. Then began the period of decline, in which one emperor, Decius, fell upon the battle-field, and another, Valerian, was carried into lifelong captivity. Simultaneously there rose up in the East (about the year 226) a new and terrible foe, the powerful Sapor, one of the Persian Sassanidæ, by whom the rule of the Parthians was overthrown, and who was burning to become a second Cyrus. Under Gallienus, Valerian’s son, 260-268, the misery of Rome reached its height. In expeditions of hitherto unheard-of magnitude, the Goths during ten years overran Asia Minor and Greece to Macedonia; the noblest and finest towns of antiquity fell in flames.