He vanquished, in the country to the north of the Caspian Sea, the nation of the _Huns_; and the new title of _Khan_, or _Cagan_, expressed the fame and power which he derived from this memorable victory.
The chain of events is interrupted, or rather is concealed, as it passes from the Volga to the Vistula, through the dark interval which separates the extreme limits of the Chinese, and of the Roman, geography.

Yet the temper of the Barbarians, and the experience of successive emigrations, sufficiently declare, that the Huns, who were oppressed by the arms of the Geougen, soon withdrew from the presence of an insulting victor.
The countries towards the Euxine were already occupied by their kindred tribes; and their hasty flight, which they soon converted into a bold attack, would more naturally be directed towards the rich and level plains, through which the Vistula gently flows into the Baltic Sea.

The North must again have been alarmed, and agitated, by the invasion of the Huns; and the nations who retreated before them must have pressed with incumbent weight on the confines of Germany.

The inhabitants of those regions, which the ancients have assigned to the Suevi, the Vandals, and the Burgundians, might embrace the resolution of abandoning to the fugitives of Sarmatia their woods and morasses; or at least of discharging their superfluous numbers on the provinces of the Roman empire.

About four years after the victorious Toulun had assumed the title of Khan of the Geougen, another Barbarian, the haughty Rhodogast, or Radagaisus, marched from the northern extremities of Germany almost to the gates of Rome, and left the remains of his army to achieve the destruction of the West.