The Roman and Byzantine Empires struggled for centuries to check the advancing tide of Asiatics, but Arab expansions under the impulse of the Mohammedan religion finally tore away all the eastern and southern coasts of the Mediterranean Sea, while from an Arabized Spain they threatened western Europe. With the White Man’s world thus rapidly receding in the south, a series of pure Mongol invasions from central Asia, sweeping north of the Caspian and Black Seas, burst upon central Europe. Attila and his Huns were the first to break through into Nordic lands as far as the plains of northern France. None of the later hordes were able to force their way so far into Nordic territories, but spent their strength upon the Alpines of the Balkans and eastern Europe.
Eastern Germany, the Austrian states, Poland, and Russia had been Nordic lands before the Slavs emerged after the fall of Rome. Whether the occupation of Teutonic lands by the Wends and Slavs in eastern Europe was an infiltration or a conquest is not known, but the conviction is growing that, like other movements which preceded and followed, it was caused by Mongoloid pressure.
That the western Slavs or Wends had been long Nordicized in speech is indicated by the thoroughly Aryan character of the Slavic languages. They found in the lands they occupied an underlying Teutonic population. They cannot be regarded as the original owners of Poland, Bohemia, Silesia, or other Wendish provinces of eastern Germany and Austria. The Teutonic Marcomanni and Quadi were in Bohemia long before the Czechs came in through the Moravian Gate in the sixth century. Pomerania and the Prussias were the home of Teutonic Lombards, Burgunds, Vandals, and Suevi, while the Crimea and the northwestern coast of the Black Sea were long held by the Nordic Goths, who, just before our era, had migrated overland from the Baltic by way of the Vistula.
No doubt some of this Nordic blood remained to ennoble the stock of the later invaders, but by the time of Charlemagne, in the greater part of Europe east of the Elbe, the Aryan language was the only bond with Europe.
When the Frankish Empire turned the tide and Christianized these Wendish and Polish lands, civilization was carried eastward until it met the Byzantine influences which brought to Russia and the lands east of the Carpathians the culture and Orthodox Christianity of the Eastern or Greek Empire.
The nucleus of Russia was organized in the ninth century by Scandinavian Varangians, the Franks of the East, who founded the first civilized state amid a welter of semi-Mongoloid tribes. How much Nordic blood they found in the territories which afterward became Russia we have no means of knowing, but it must have been considerable because we do know that from the Middle Ages to the present time there has been a progressive increase in brachycephaly or broad-headedness, to judge from the rise in the percentage of round skulls found in the cemeteries of Moscow and elsewhere in Russia.
Such was the condition of eastern Europe when a new and terrible series of Mongoloid invasions swept over it, this time directly from the centre of Asia.
The effect of these invasions was so profound and lasting that it may be well to consider briefly the condition of eastern Europe after the elimination of the Nordics and its partial occupation by the so-called Slavs. Beginning with Attila and his Huns, in the fourth century, there was a series of purely Mongoloid tribes entering from Asia in wave after wave.
Similar waves ultimately passed south of the Black and Caspian Seas, and were called Turks, but these were long held back by the power of the Byzantine Empire, to which history has done scant justice.
In the north these invaders, called in the later days Tatars, but all essentially of central Asiatic Mongol stock, occupied Balkan lands after the expansion of the south Slavs in those countries. They are known by various names, but they are all part of the same general movement, although there was a gradual slowing down of the impulse. Prior to Jenghiz Khan the later hordes did not reach quite as far west as the earlier ones.