But although the Chinese historians thus loosely confine the Five- Protector period to less than a century of time, it is a fact that Ts'u and Tsin went on obstinately struggling for the hegemony, or for practical predominance, for at least another 200 years; besides, Ts'in, Ts'u, and Sung were never formally nominated by the Emperor as Protectors, nor were they ever accepted as such by the Chinese federal princes in the permanent and definite way that Ts'i and Tsin had been and were accepted. Moreover, the barbarian states of Wu and Yüeh each in turn acted very effectively as Protector, and are never included in the Five-Great-Power series. The fact is, the Chinese have never grasped the idea of principles in history: their annals are mere diaries of events; and when once an apparently definite "period" is named by an annalist, they go on using it, quite regardless of its inconsistency when confronted with facts adverse to a logical acceptance of it. The situation was this: Tsin and Ts'u were at perpetual loggerheads about the small Chinese states that lay between them, more especially about the state of Cheng, which, though small, was of quite recent imperial stock, and was, moreover, well supplied with brains. Tsin and Ts'in were at perpetual loggerheads about the old Tsin possessions on the west bank of the Yellow River, which, running from the north to the south, lay between them; and about their rival claims to influence the various nomadic Tartar tribes living along both the banks, Tsin and Ts'i were often engaged in disputes about Lu, Wei, and other orthodox states situated in the Lower Yellow River valley running from the west to the east and north-east; also in questions concerning eastern barbarian states inhabiting the whole coast region, and concerning the petty Chinese states which had degenerated, and whose manners savoured of barbarian ways. Thus Ts'in and Ts'u, and also to some extent Ts'i and Ts'u, had a regular tendency to ally themselves against Tsin's flanks, and it was therefore always Tsin's policy as the "middle man" to obstruct communications between Ts'in and Ts'u, and between Ts'i and Ts'u. In 580 Tsin devised a means of playing off a similar flanking game upon Ts'u: negotiations were opened with Wu, which completely barbarous state only begins to appear in history at all at about this period, all the kings having manifestly phonetic barbarian names, which mean absolutely nothing (beyond conveying the sound) as expressed in Chinese, Wu was taught the art of war, as we have seen, by (page 34) a Ts'u traitor who had fled to Tsin and taken service there; and the King of Wu soon made things so uncomfortable for Ts'u that the latter in turn tried by every means to block the way between Tsin and Wu. Within a single generation Wu was so civilized that one of the royal princes was sent the rounds of the Chinese states as special ambassador, charged, under the convenient cloak of seeking for