9. Should the army forestall you in occupying a pass, do
not go after him if the pass is fully garrisoned, but only if it
is weakly garrisoned.
10. With regard to PRECIPITOUS HEIGHTS, if you are
beforehand with your adversary, you should occupy the raised and
sunny spots, and there wait for him to come up.
[Ts`ao Kung says: "The particular advantage of securing
heights and defiles is that your actions cannot then be dictated
by the enemy." [For the enunciation of the grand principle
alluded to, see VI. ss. 2]. Chang Yu tells the following
anecdote of P`ei Hsing-chien (A.D. 619-682), who was sent on a
punitive expedition against the Turkic tribes. "At night he
pitched his camp as usual, and it had already been completely
fortified by wall and ditch, when suddenly he gave orders that
the army should shift its quarters to a hill near by. This was
highly displeasing to his officers, who protested loudly against
the extra fatigue which it would entail on the men. P`ei Hsing-
chien, however, paid no heed to their remonstrances and had the
camp moved as quickly as possible. The same night, a terrific
storm came on, which flooded their former place of encampment to
the depth of over twelve feet. The recalcitrant officers were
amazed at the sight, and owned that they had been in the wrong.
'How did you know what was going to happen?' they asked. P`ei
Hsing-chien replied: 'From this time forward be content to obey
orders without asking unnecessary questions.' From this it may
be seen," Chang Yu continues, "that high and sunny places are
advantageous not only for fighting, but also because they are
immune from disastrous floods."]
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