Reference has been made to the Hiongnou or Hun tribes, against whom Tsin Hwangti built the Great Wall. In the interval between the death of that ruler and the consolidation of the power of Kaotsou, a remarkable chief named Meha, or Meta, had established his supremacy among the disunited clans of the Mongolian Desert, and had succeeded in combining for purposes of war the whole fighting force of what had been a disjointed and barbarous confederacy. The Chinese rulers had succeeded in keeping back this threatening torrent from overflowing the fertile plains of their country, as much by sowing dissension among these clans and by bribing one chief to fight another, as by superior arms. But Meha's success rendered this system of defense no longer possible, and the desert chieftain, realizing the opportunity of spoil and conquest, determined to make his position secure by invading China. If the enterprise had failed, there would have been an end to the paramounce of Meha, but his rapid success convinced the Huns that their proper and most profitable policy was to carry on implacable war with their weak and wealthy neighbors. Meha's success was so great that in a single campaign he recovered all the districts taken from the Tartars by the general Moungtien. He turned the western angle of the Great Wall, and brought down his frontier to the river Hoangho. His light cavalry raided past the Chinese capital into the province of Szchuen, and returned laden with the spoil of countless cities. These successes were crowned by a signal victory over the emperor in person. Kaotsou was drawn into an ambuscade in which his troops had no chance with their more active adversaries, and, to save himself from capture, Kaotsou had no alternative but to take refuge in the town of Pingching, where he was closely beleaguered. It was impossible to defend the town for any length of time, and the capture of Kaotsou seemed inevitable, when recourse was had to a stratagem. The most beautiful Chinese maiden was sent as a present to propitiate the conqueror, and Meha, either mollified by the compliment, or deeming that nothing was to be gained by driving the Chinese to desperation, acquiesced in a convention which, while it sealed the ignominious defeat of the Chinese, rescued their sovereign from his predicament.