10. (5) When you start a fire, be to windward of it. Do
not attack from the leeward.
[Chang Yu, following Tu Yu, says: "When you make a fire,
the enemy will retreat away from it; if you oppose his retreat
and attack him then, he will fight desperately, which will not
conduce to your success." A rather more obvious explanation is
given by Tu Mu: "If the wind is in the east, begin burning to
the east of the enemy, and follow up the attack yourself from
that side. If you start the fire on the east side, and then
attack from the west, you will suffer in the same way as your
enemy."]
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