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[Literally "visitors", is equivalent, as Tu Yu says, to "those

whose duty it is to keep the general supplied with information,"

which naturally necessitates frequent interviews with him.]

the door-keepers and sentries of the general in command. Our

spies must be commissioned to ascertain these.

[As the first step, no doubt towards finding out if any of these

important functionaries can be won over by bribery.]

21. The enemy's spies who have come to spy on us must be sought

out, tempted with bribes, led away and comfortably housed. Thus

they will become converted spies and available for our service.

22. It is through the information brought by the converted spy

that we are able to acquire and employ local and inward spies.