7.29

Chapter: Maneuvering 7.29
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Translation:

A clever general, therefore, avoids an army when its spirit is keen, but attacks it when it is sluggish and inclined to return. This is the art of studying moods.

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Commentary

Hence if you can engage the enemy when your spirit is high and theirs is low, then you have a significant advantage.

Likewise it is unwise to engage when the spirits of your people are low.