"He must be able to mystify his officers and men by false reports and appearances, and thus keep them in total ignorance."

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A clever general... 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. Disciplined and calm, he awaits the appearance of disorder and hubbub among the enemy. This is the art of retaining self-possession.

— Sun Tzu