a. A defile can be used to bypass natural or man-made features which restrict traffic flow to one
way at a time. However, movement at a defile is restricted. This gives the enemy a good chance to try
to disrupt operations. (see Figure 7-1.)
b. MP operating a defile must:
(1) Be assigned and prepare fighting positions.
(2) Control traffic entering and leaving the defile at both ends.
(3) Keep security throughout the defile.
(4) Be prepared to notify road users of traffic and tactical situations.
3. Emplacing a Defile.
Prior to emplacing the defile, conduct a recon of the area and of the proposed location. Choose the
method you will use to operate the defile. This will be based on the tactical situation and the number of
a. Operation methods:
(1) Flag - At one entrance to the defile, a flag is given to the last vehicle in a group entering the
defile. The flag is given to the control person at the other end. The process is then repeated in the
(2) Rider - Same as flag method except the control person rides in the last vehicle in each
group. This method is used when it is necessary to ensure that all vehicles have cleared the area.
(3) Lead vehicle - Leads the convoy through the defile. This method is used when movement
through the defile is confusing and/or long.
(4) Trail vehicles - Same as flag and rider except use a vehicle.
(5) Visual - Control personnel at each end of the defile can see each other.
normally used in small defile operations. Holding areas are not normally needed there.
(6) Communications - Radios are used as a last resort. Field phones should be used to control
entrance to defiles.
b. Set up a temporary or static defense for the defile. This will be based on the amount of time the
defile will be used.