Mistislaf had probably no objection to the Poloftsi being annihilated by some tribe stronger and fiercer than themselves, for they gave him a great deal of trouble by their frequent raids; but he perceived the force of the argument about his own turn coming next, and thought it wise to assist his usually hostile neighbours. For the purpose of warding off the danger he called together the neighbouring Princes, and urged them to join him in an expedition against the new enemy. The expedition was undertaken, and ended in disaster. On the Kalka, a small river falling into the Sea of Azof, the Russian host met the invaders, and was completely routed. The country was thereby opened to the victors, but they did not follow up their advantage. After advancing for some distance they suddenly wheeled round and disappeared.
Thus ended unexpectedly the first visit of these unwelcome strangers. Thirteen years afterwards they returned, and were not so easily got rid of. An enormous horde crossed the River Ural and advanced into the heart of the country, pillaging, burning, devastating, and murdering. Nowhere did they meet with serious resistance. The Princes made no attempt to combine against the common enemy. Nearly all the principal towns were laid in ashes, and the inhabitants were killed or carried off as slaves. Having conquered Russia, they advanced westward, and threw all Europe into alarm. The panic reached even England, and interrupted, it is said, for a time the herring fishing on the coast. Western Europe, however, escaped their ravages. After visiting Poland, Hungary, Bulgaria, Servia, and Dalmatia, they retreated to the Lower Volga, and the Russian Princes were summoned thither to do homage to the victorious Khan.
At first the Russians had only very vague notions as to who this terrible enemy was. The old chronicler remarks briefly: "For our sins unknown peoples have appeared. No one knows who they are or whence they have come, or to what race and faith they belong. They are commonly called Tartars, but some call them Tauermen, and others Petchenegs. Who they really are is known only to God, and perhaps to wise men deeply read in books." Some of these "wise men deeply read in books" supposed them to be the idolatrous Moabites who had in Old Testament times harassed God's chosen people, whilst others thought that they must be the descendants of the men whom Gideon had driven out, of whom a revered saint had prophesied that they would come in the latter days and conquer the whole earth, from the East even unto the Euphrates, and from the Tigris even unto the Black Sea.
We are now happily in a position to dispense with such vague ethnographical speculations. From the accounts of several European travellers who visited Tartary about that time, and from the writings of various Oriental historians, we know a great deal about these barbarians who conquered Russia and frightened the Western nations.
The vast region lying to the east of Russia, from the basin of the Volga to the shores of the Pacific Ocean, was inhabited then, as it is still, by numerous Tartar and Mongol tribes. These two terms are often regarded as identical and interchangeable, but they ought, I think, to be distinguished. From the ethnographic, the linguistic, and the religious point of view they differ widely from each other. The Kazan Tartars, the Bashkirs, the Kirghiz, in a word, all the tribes in the country stretching latitudinally from the Volga to Kashgar, and longitudinally from the Persian frontier, the Hindu Kush and the Northern Himalaya, to a line drawn east and west through the middle of Siberia, belong to the Tartar group; whereas those further eastward, occupying Mongolia and Manchuria, are Mongol in the stricter sense of the term.
A very little experience enables the traveller to distinguish between the two. Both of them have the well-known characteristics of the Northern Asiatic—the broad flat face, yellow skin, small, obliquely set eyes, high cheekbones, thin, straggling beard; but these traits are more strongly marked, more exaggerated, if we may use such an expression, in the Mongol than in the Tartar. Thus the Mongol is, according to our conceptions, by far the uglier of the two, and the man of Tartar race, when seen beside him, appears almost European by comparison. The distinction is confirmed by a study of their languages. All the Tartar languages are closely allied, so that a person of average linguistic talent who has mastered one of them, whether it be the rude Turki of Central Asia or the highly polished Turkish of Stambul, can easily acquire any of the others; whereas even an extensive acquaintance with the Tartar dialects will be of no practical use to him in learning a language of the Mongol group. In their religions likewise the two races differ. The Mongols are as a rule Shamanists or Buddhists, while the Tartars are Mahometans. Some of the Mongol invaders, it is true, adopted Mahometanism from the conquered Tartar tribes, and by this change of religion, which led naturally to intermarriage, their descendants became gradually blended with the older population; but the broad line of distinction was not permanently effaced.
It is often supposed, even by people who profess to be acquainted with Russian history, that Mongols and Tartars alike first came westward to the frontiers of Europe with Genghis Khan. This is true of the Mongols, but so far as the Tartars are concerned it is an entire mistake. From time immemorial the Tartar tribes roamed over these territories. Like the Russians, they were conquered by the Mongol invaders and had long to pay tribute, and when the Mongol empire crumbled to pieces by internal dissensions and finally disappeared before the victorious advance of the Russians, the Tartars reappeared from the confusion without having lost, notwithstanding an intermixture doubtless of Mongol blood, their old racial characteristics, their old dialects, and their old tribal organisation.
The germ of the vast horde which swept over Asia and advanced into the centre of Europe was a small pastoral tribe of Mongols living in the hilly country to the north of China, near the sources of the Amur. This tribe was neither more warlike nor more formidable than its neighbours till near the close of the twelfth century, when there appeared in it a man who is described as "a mighty hunter before the Lord." Of him and his people we have a brief description by a Chinese author of the time: "A man of gigantic stature, with broad forehead and long beard, and remarkable for his bravery. As to his people, their faces are broad, flat, and four-cornered, with prominent cheek-bones; their eyes have no upper eyelashes; they have very little hair in their beards and moustaches; their exterior is very repulsive." This man of gigantic stature was no other than Genghis Khan. He began by subduing and incorporating into his army the surrounding tribes, conquered with their assistance a great part of Northern China, and then, leaving one of his generals to complete the conquest of the Celestial Empire, he led his army westward with the ambitious design of conquering the whole world. "As there is but one God in heaven," he was wont to say, "so there should be but one ruler on earth"; and this one universal ruler he himself aspired to be.
A European army necessarily diminishes in force and its existence becomes more and more imperilled as it advances from its base of operations into a foreign and hostile country. Not so a horde like that of Genghis Khan in a country such as that which it had to traverse. It needed no base of operations, for it took with it its flocks, its tents, and all its worldly goods. Properly speaking, it was not an army at all, but rather a people in movement. The grassy Steppes fed the flocks, and the flocks fed the warriors; and with such a simple commissariat system there was no necessity for keeping up communications with the point of departure. Instead of diminishing in numbers, the horde constantly increased as it moved forwards. The nomadic tribes which it encountered on its way, composed of men who found a home wherever they found pasture and drinking-water, required little persuasion to make them join the onward movement. By means of this terrible instrument of conquest Genghis succeeded in creating a colossal Empire, stretching from the Carpathians to the eastern shores of Asia, and from the Arctic Ocean to the Himalayas.
Genghis was no mere ruthless destroyer; he was at the same time one of the greatest administrators the world has ever seen. But his administrative genius could not work miracles. His vast Empire, founded on conquest and composed of the most heterogeneous elements, had no principle of organic life in it, and could not possibly be long-lived. It had been created by him, and it perished with him. For some time after his death the dignity of Grand Khan was held by some one of his descendants, and the centralised administration was nominally preserved; but the local rulers rapidly emancipated themselves from the central authority, and within half a century after the death of its founder the great Mongol Empire was little more than "a geographical expression."