completely parasitic, with no support of the masses or the gentry. After Shih Hu's death there were fearful combats between his sons; ultimately a member of an entirely different family of Hun origin seized power, but was destroyed in 352 by the Hsien-pi, bringing to an end the Later Chao dynasty.
2 Earlier Yen dynasty in the north-east (proto-Mongol; 352-370), and the Earlier Ch'in dynasty in all north China (Tibetan; 351-394)
In the north, proto-Mongol Hsien-pi tribes had again made themselves independent; in the past they had been subjects of Liu Yüan and then of Shih Lo. A man belonging to one of these tribes, the tribe of the Mu-jung, became the leader of a league of tribes, and in 337 founded the state of Yen. This proto-Mongol state of the Mu-jung, which the historians call the "Earlier Yen" state, conquered parts of southern Manchuria and also the state of Kao-li in Korea, and there began then an immigration of Hsien-pi into Korea, which became noticeable at a later date. The conquest of Korea, which was still, as in the past, a Japanese market and was very wealthy, enormously strengthened the state of Yen. Not until a little later, when Japan's trade relations were diverted to central China, did Korea's importance begin to diminish. Although this "Earlier Yen dynasty" of the Mu-jung officially entered on the heritage of the Huns, and its régime was therefore dated only from 352 (until 370), it failed either to subjugate the whole realm of the "Later Chao" or effectively to strengthen the state it had acquired. This old Hun territory had suffered economically from the anti-agrarian nomad tendency of the last of the Hun emperors; and unremunerative wars against the Chinese in the south had done nothing to improve its position. In addition to this, the realm of the Toba was dangerously gaining strength on the flank of the new empire. But the most dangerous enemy was in the west, on former Hun soil, in the province of Shensi—Tibetans, who finally came forward once more with claims to dominance. These were Tibetans of the P'u family, which later changed its name to Fu. The head of the family had worked his way up as a leader of Tibetan auxiliaries under the "Later Chao", gaining more and more power and following. When under that dynasty the death of Shih Hu marked the beginning of general dissolution, he gathered his Tibetans around him in the west, declared himself independent of the Huns, and made himself emperor of the "Earlier Ch'in dynasty" (351-394). He died in 355, and was followed after a short interregnum by Fu Chien (357-385), who
was unquestionably one of the most important figures of the fourth century. This Tibetan empire ultimately defeated the "Earlier Yen dynasty" and annexed the realm of the Mu-jung. Thus the Mu-jung Hsien-pi came under the dominion of the Tibetans; they were distributed among a number of places as garrisons of mounted troops.
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 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.
Against them the north had these assets: the possession of the best northern tillage, the control of the trade routes, and "Chinese" culture and administration. At the time, however, these represented only potentialities and not tangible realities. It would have taken ten to twenty years to restore the capacities of the north after its devastation in many wars, to reorganize commerce, and to set up a really reliable administration, and thus to interlock the various elements and consolidate the various tribes. But as early as 383 Fu Chien started his great campaign against the south, with an army of something like a million men. At first the advance went well. The horsemen from the north, however, were men of the mountain country, and in the soggy plains of the Yangtze region, cut up by hundreds of water-courses and canals, they suffered from climatic and natural conditions to which they were unaccustomed. Their main strength was still in cavalry; and they came to grief. The supplies and reinforcements for the vast army failed to arrive in time; units did not reach the appointed places at the appointed dates. The southern troops under the supreme command of Hsieh Hsüan, far inferior in numbers and militarily of no great efficiency, made surprise attacks on isolated units before these were in regular formation. Some they defeated, others they bribed; they spread false reports. Fu Chien's army was seized with widespread panic, so that he was compelled to retreat in haste. As he did so it became evident that his empire had no inner stability: in a very short time it fell into fragments. The south Chinese had played no direct part in this, for in spite of their victory they were not strong enough to advance far to the north.
3 The fragmentation of north China
The first to fall away from the Tibetan ruler was a noble of the Mu-jung, a member of the ruling family of the "Earlier Yen dynasty", who withdrew during the actual fighting to pursue a policy of his own. With the vestiges of the Hsien-pi who followed him, mostly cavalry, he fought his way northwards into the old homeland of the Hsien-pi and there, in central Hopei, founded the "Later Yen dynasty" (384-409), himself reigning for twelve years. In the remaining thirteen years of the existence of that dynasty