The Art of War by Zi Sun (recommended ebook reader .TXT) 📕

27. Hence it is only the enlightened ruler and the wise general who will use the highest intelligence of the army for purposes of spying and thereby they achieve great results.

[Tu Mu closes with a note of warning: "Just as water, which carries a boat from bank to bank, may also be the means of sinking it, so reliance on spies, while production of great results, is oft-times the cause of utter destruction."]

Spies are a most important element in war, because on them depends an army's ability to move.

     [Chia Lin says that an army without spies is like a man with
ears or eyes.]

[1] "Aids to Scouting," p. 2.

[2] "Marshal Turenne," p. 311.

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