The Mongols were in the twelfth century a tribe subject to those Kin who had conquered Northeast China. They were a horde of nomadic horsemen living in tents, and subsisting mainly upon mare's milk products and meat. Their occupations were pasturage and hunting, varied by war. They drifted northward as the snows melted for summer pasture, and southward to winter pasture after the custom of the steppes. Their military education began with a successful insurrection against the Kin. The empire of Kin had the resources of half China behind it, and in the struggle the Mongols learnt very much of the military science of the Chinese. By the end of the twelfth century they were already a fighting tribe of exceptional quality.
The opening years of the career of Jengis were spent in developing his military machine, in assimilating the Mongols and the associated tribes about them into one organized army. His first considerable extension of power was westward, when the Tartar Kirghis and the Uigurs (who were the Tartar people of the Tarim basin) were not so much conquered as induced to join his organization. He then attacked the Kin empire and took Pekin (1214). The Khitan people, who had been so recently subdued by the Kin, threw in their fortunes with his, and were of very great help to him. The settled Chinese population went on sowing and reaping and trading during this change of masters without lending its weight to either side.
We have already mentioned the very recent Kharismian empire of Turkestan, Persia, and North India. This empire extended eastward to Kashgar, and it must have seemed one of the most progressive and hopeful empires of the time. Jengis Khan, while still engaged in this war with the Kin empire, sent envoys to Kharismia. They were put to death, an almost incredible stupidity. The Kharismian government, to use the political jargon of to-day, had decided not to "recognize" Jengis Khan, and took this spirited course with him. Thereupon (1218) the great host of horsemen that Jengis Khan had consolidated and disciplined swept over the Pamirs and down into Turkestan. It was well armed, and probably it had some guns and gunpowder for siege work—for the Chinese were certainly using gunpowder at this time, and the Mongols learnt its use from them. Kashgar,
