Infantry Drills

5-21: Infiltration

Previous: 5-19: Close Column

5-21. Infiltration provides the best possible passive defense against enemy observation and attack. It is suited when time, space, security, deception, and dispersion are necessary. During infiltration, vehicles are dispatched in small groups, or at irregular intervals, at a rate that keeps the traffic density low and prevents undue massing of vehicles during the movement.

5-22. The disadvantages of an infiltration are that more time is required to complete the move, column control is nearly impossible, and recovery of broken-down vehicles by the trail party is more protracted when compared to vehicle recovery in close and open columns. Additionally, unit integrity is not restored until the last vehicle arrives at the destination, complicating the unit’s onward deployment. Infiltration during troop movement should not be confused with infiltration as a form of maneuver as discussed in chapter 2 of this publication.

5-23. During extended road marches, halts are necessary to rest personnel, service vehicles, and adjust movement schedules. The march order or unit SOP regulates when to take halts, and addresses actions for various tapes of halts, such as maintenance, security, and unexpected halts. During halts, each unit normally clears the march route and moves to a previously selected AA to prevent route congestion and avoid being a lucrative target. Units establish security and take other measures to protect the force.

5-24. In motor movements, short halts are scheduled every two to three hours of
movement and halts may last up to an hour. Long halts occur on marches that exceed 24 hours and last no more than two hours. Long halts are not scheduled at night, which allows maximum time for night movement. Unit leaders promptly notify commanders of the time and approximate length of unscheduled halts.

Next: 5-25: Approach March

Go Back To: U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad