13. Hence those who use fire as an aid to the attack show
intelligence; those who use water as an aid to the attack gain an
accession of strength.
14. By means of water, an enemy may be intercepted, but not
robbed of all his belongings.
[Ts`ao Kung's note is: "We can merely obstruct the enemy's
road or divide his army, but not sweep away all his accumulated
stores." Water can do useful service, but it lacks the terrible
destructive power of fire. This is the reason, Chang Yu
concludes, why the former is dismissed in a couple of sentences,
whereas the attack by fire is discussed in detail. Wu Tzu (ch.
4) speaks thus of the two elements: "If an army is encamped on
low-lying marshy ground, from which the water cannot run off, and
where the rainfall is heavy, it may be submerged by a flood. If
an army is encamped in wild marsh lands thickly overgrown with
weeds and brambles, and visited by frequent gales, it may be
exterminated by fire."]
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