the Chin State; Wang-tzu, [8] in the service of Ch`i; and Sun
Wu, in the service of Wu. These men developed and threw
light upon the principles of war.

It is obvious enough that Ssu-ma Ch`ien at least had no
doubt about the reality of Sun Wu as an historical personage; and
with one exception, to be noticed presently, he is by far the
most important authority on the period in question. It will not
be necessary, therefore, to say much of such a work as the WU
YUEH CH`UN CH`IU, which is supposed to have been written by Chao
Yeh of the 1st century A.D. The attribution is somewhat
doubtful; but even if it were otherwise, his account would be of
little value, based as it is on the SHIH CHI and expanded with
romantic details. The story of Sun Tzu will be found, for what
it is worth, in chapter 2. The only new points in it worth
noting are: (1) Sun Tzu was first recommended to Ho Lu by Wu
Tzu-hsu. (2) He is called a native of Wu. (3) He had previously
lived a retired life, and his contemporaries were unaware of his
ability.
The following passage occurs in the Huai-nan Tzu: "When
sovereign and ministers show perversity of mind, it is impossible
even for a Sun Tzu to encounter the foe." Assuming that this
work is genuine (and hitherto no doubt has been cast upon it), we
have here the earliest direct reference for Sun Tzu, for Huai-nan
Tzu died in 122 B.C., many years before the SHIH CHI was given to
the world.
Liu Hsiang (80-9 B.C.) says: "The reason why Sun Tzu at the
head of 30,000 men beat Ch`u with 200,000 is that the latter were
undisciplined."
Teng Ming-shih informs us that the surname "Sun" was