The empire of the Tibetans was organized quite differently from the empires of the Huns and the Hsien-pi tribes. The Tibetan organization was purely military and had nothing to do with tribal structure. This had its advantages, for the leader of such a formation had no need to take account of tribal chieftains; he was answerable to no one and possessed considerable personal power. Nor was there any need for him to be of noble rank or descended from an old family. The Tibetan ruler Fu Chien organized all his troops, including the non-Tibetans, on this system, without regard to tribal membership. Fu Chien's state showed another innovation: the armies of the Huns and the Hsien-pi had consisted entirely of cavalry, for the nomads of the north were, of course, horsemen; to fight on foot was in their eyes not only contrary to custom but contemptible. So long as a state consisted only of a league of tribes, it was simply out of the question to transform part of the army into infantry. Fu Chien, however, with his military organization that paid no attention to the tribal element, created an infantry in addition to the great cavalry units, recruiting for it large numbers of Chinese. The infantry proved extremely valuable, especially in the fighting in the plains of north China and in laying siege to fortified towns. Fu Chien thus very quickly achieved military predominance over the neighbouring states. As we have seen already, he annexed the "Earlier Yen" realm of the proto-Mongols (370), but he also annihilated the Chinese "Earlier Liang" realm (376) and in the same year the small Turkish Toba realm. This made him supreme over all north China and stronger than any alien ruler before him. He had in his possession both the ancient capitals, Ch'ang-an and Loyang; the whole of the rich agricultural regions of north China belonged to him; he also controlled the routes to Turkestan. He himself had a Chinese education, and he attracted Chinese to his court; he protected the Buddhists; and he tried in every way to make the whole country culturally Chinese. As soon as Fu Chien had all north China in his power, as Liu Yüan and his Huns had done before him, he resolved, like Liu Yüan, to make every effort to gain the mastery over all China, to become emperor of China. Liu Yüan's successors had not had the capacity for which such a venture called; Fu Chien was to fail in it for other reasons. Yet, from a military point of view, his chances were not bad. He had far more soldiers under his command than the Chinese "Eastern Chin dynasty" which ruled the south, and his troops were undoubtedly better. In the time of the founder of the Tibetan dynasty the southern empire had been utterly defeated by his troops (354), and the south Chinese were no stronger now.