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12. On open ground, do not try to block the enemy's way.

[Because the attempt would be futile, and would expose the

blocking force itself to serious risks. There are two

interpretations available here. I follow that of Chang Yu. The

other is indicated in Ts'ao Kung's brief note: "Draw closer

together"-i.e., see that a portion of your own army is not cut

off.]

On ground of intersecting highways, join hands with your allies.

[Or perhaps, "form alliances with neighbouring states."]

13. On serious ground, gather in plunder.