19. Thus one who is skillful at keeping the enemy on the
move maintains deceitful appearances, according to which the
enemy will act.
[Ts`ao Kung's note is "Make a display of weakness and want."
Tu Mu says: "If our force happens to be superior to the enemy's,
weakness may be simulated in order to lure him on; but if
inferior, he must be led to believe that we are strong, in order
that he may keep off. In fact, all the enemy's movements should
be determined by the signs that we choose to give him." Note the
following anecdote of Sun Pin, a descendent of Sun Wu: In 341
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.] ]
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