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20. The following are the principles to be observed by an

invading force: The further you penetrate into a country, the

greater will be the solidarity of your troops, and thus the

defenders will not prevail against you.

21. Make forays in fertile country in order to supply your army

with food.

[Cf. supra, § 13. Li Ch'uan does not venture on a note here.]

22. Carefully study the well-being of your men,

[For "well-being", Wang Hsi means, "Pet them, humor them, give

them plenty of food and drink, and look after them generally."]

and do not overtax them. Concentrate your energy and hoard your

strength.