1. Judgment in deciding what equipment is appropriate to the particular patrol. 2. Sketch copies; contours as guides for concealed route. 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. 6. Danger of startling a friend sentinel by unwarned approach. Eleventh Problem--Detached Post: A. Definition and Function.--Posted where connection cannot be easily maintained with other elements of outpost. Sent usually by outpost reserve or by main body, and retires to them, rather than to the line of supports. Function same as element of outpost proper,--_observation, resistance, reconnaissance_; but less resistance than _warning_. May be as small as 2 men, or as large as a support, depending on location and importance of detached position. B. Principles. 1. Established under precautions, because of danger of enemy breaking between the main body and the detached post. 2. Entrenchment: what time of day? What other circumstances? Treatment of bridges? Night? 3. Requisitioning order: Need of payment; for justice, for military advantage later (reassure farmers through whose territory you will need to pass and keep supplied). Twelfth Problem--Requisitioning Detachment or Patrol: A. Definition and Function.--A patrol may have any mission: here it is sent to take (on payment) the provender designated. A.r.d. sent by commander with specific instructions, is legal; a raid for booty illegal. (See f.s.r., sec, 290.) B. Principles. 1. Preparation essential. 2. Sending of men singly or in pairs across open spaces. 3. Deliberate start on _wrong_ road to deceive enemy scouts. 4. Not to fire unless obliged,--until return trip. Thirteenth Problem--A Contact Patrol: