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He sacrifices something, that the enemy may snatch at it.

20. By holding out baits, he keeps him on the march; then with a

body of picked men he lies in wait for him.

[With an emendation suggested by Li Ching, this then reads, "He

lies in wait with the main body of his troops."]

21. The clever combatant looks to the effect of combined energy,

and does not require too much from individuals.

[Tu Mu says: "He first of all considers the power of his army in

the bulk; afterwards he takes individual talent into account, and

uses each men according to his capabilities. He does not demand

perfection from the untalented."]

Hence his ability to pick out the right men and utilise combined

energy.

22. When he utilises combined energy, his fighting men become as

it were like unto rolling logs or stones. For it is the nature of

a log or stone to remain motionless on level ground, and to move

when on a slope; if four-cornered, to come to a standstill, but

if round-shaped, to go rolling down.