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3. After crossing a river, you should get far away from it.

["In order to tempt the enemy to cross after you," according to

Ts'ao Kung, and also, says Chang Yu, "in order not to be impeded

in your evolutions." The T'ung Tien reads, "If the enemy crosses

a river," etc. But in view of the next sentence, this is almost

certainly an interpolation.]

4. When an invading force crosses a river in its onward march, do

not advance to meet it in mid-stream. It will be best to let half

the army get across, and then deliver your attack.