9.16

Chapter: The Army on the March 9.16
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Translation:

While we keep away from such places, we should get the enemy to approach them; while we face them, we should let the enemy have them on his rear.

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Commentary

Just as obstacles can be trouble for you, so also can they be trouble for enemies, especially those who do not know the lie of the land. You can use obstacles to ambush or generally make like difficult for the other side.

This is another reason why scouting ahead can offer you advantage.