3. Fight only in self defence.
4. How to question hidden sentinel without disclosing his
position to enemy.
5. Judicious choice of cover in approaching destination.
6. Dating and placing of messages.
7. Rate of passage of troops: "Rule of 2-2-2."

Tenth Problem--Visiting Patrol:

A. Definition and Function:

Two men or more sent from supports and pickets liaison between
adjoining outguards. More useful at night, because of
reduced visibility of terrain between outguards.

1. Inform the sending body of conditions at sentinel posts.
2. Prevent enemy from penetrating lines between posts.
3. Exchange information between adjoining posts.
4. Take back captured strangers to commander.
5. Reenforce feeling of mutual support among the isolated
sentinels.

B. Principles.

1. Keen sight and hearing; silence.
2. Need of signals. Both countersign and check--countersign.
3. Equipment; nothing that rattles or glistens.
4. Disposition: leader in front, because of need for quick
decision.
5. Distance not over two miles even in most open country.