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[Tu Mu gives a graphic touch: all communication with spies should

be carried "mouth-to-ear." The following remarks on spies may be

quoted from Turenne, who made perhaps larger use of them than any

previous commander: "Spies are attached to those who give them

most, he who pays them ill is never served. They should never be

known to anybody; nor should they know one another. When they

propose anything very material, secure their persons, or have in

your possession their wives and children as hostages for their

fidelity. Never communicate anything to them but what is

absolutely necessary that they should know. [2] ]

15. Spies cannot be usefully employed without a certain intuitive

sagacity.