“It is only the enlightened ruler and the wise general who will use the highest intelligence of the army for the purposes of spying, and thereby they achieve great results.”
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Secret operations are essential in war upon them the army relies to make its every move.
Now the reason the enlightened prince and the wise general conquer the enemy whenever they move and their achievements surpass those of ordinary men is foreknowledge.
In the practical art of war, the best thing of all is to take the enemy's country whole and intact to shatter and destroy it is not so good.
All war is deception.