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12. In every army, the five developments connected with fire must

be known, the movements of the stars calculated, and a watch kept

for the proper days.

[Tu Mu says: "We must make calculations as to the paths of the

stars, and watch for the days on which wind will rise, before

making our attack with fire." Chang Yu seems to interpret the

text differently: "We must not only know how to assail our

opponents with fire, but also be on our guard against similar

attacks from them."]

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.