9.31

Chapter: The Army on the March 9.31
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Translation:

If the enemy sees an advantage to be gained and makes no effort to secure it, the soldiers are exhausted.

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Commentary

Opportunity and potential advantage often need to be grasped quickly in war as they easily pass. When soldiers do not make such attempts it seems likely that they lack the energy or motivation to do so, in which case they are more ripe for attack.