B.C., the Ch`i State being at war with Wei, sent T`ien Chi and
Sun Pin against the general P`ang Chuan, who happened to be a
deadly personal enemy of the later. Sun Pin said: "The Ch`i
State has a reputation for cowardice, and therefore our adversary
despises us. Let us turn this circumstance to account."
Accordingly, when the army had crossed the border into Wei
territory, he gave orders to show 100,000 fires on the first
night, 50,000 on the next, and the night after only 20,000.
P`ang Chuan pursued them hotly, saying to himself: "I knew these
men of Ch`i were cowards: their numbers have already fallen away
by more than half." In his retreat, Sun Pin came to a narrow
defile, with he calculated that his pursuers would reach after
dark. Here he had a tree stripped of its bark, and inscribed
upon it the words: "Under this tree shall P`ang Chuan die."
Then, as night began to fall, he placed a strong body of archers
in ambush near by, with orders to shoot directly they saw a
light. Later on, P`ang Chuan arrived at the spot, and noticing
the tree, struck a light in order to read what was written on it.
His body was immediately riddled by a volley of arrows, and his
whole army thrown into confusion. [The above is Tu Mu's version
of the story; the SHIH CHI, less dramatically but probably with
more historical truth, makes P`ang Chuan cut his own throat with
an exclamation of despair, after the rout of his army.] ]

He sacrifices something, that the enemy may snatch at it.

20. By holding out baits, he keeps him on the march; then
with a body of picked men he lies in wait for him.

[With an emendation suggested by Li Ching, this then reads,
"He lies in wait with the main body of his troops."]

21. The clever combatant looks to the effect of combined
energy, and does not require too much from individuals.

[Tu Mu says: "He first of all considers the power of his
army in the bulk; afterwards he takes individual talent into
account, and uses each men according to his capabilities. He
does not demand perfection from the untalented."]

Hence his ability to pick out the right men and utilize combined
energy.
22. When he utilizes combined energy, his fighting men
become as it were like unto rolling logs or stones. For it is
the nature of a log or stone to remain motionless on level
ground, and to move when on a slope; if four-cornered, to come to
a standstill, but if round-