FM 3-34.22 - Army Electronic Publications & Forms - U.S. Army

Engineer Support to Combat Operations
6-57. The maneuver unit may use supporting forces or follow-and-support forces to widen the penetration
and improve the breach lanes. The ENCOORD must understand the commander’s intent to ensure that
forces have enough engineer support. When a follow-and-support force is employed, it assumes the
responsibility for widening the POP and improving the lanes. This may require a smaller, more centralized
engineer organization to accomplish that task.
Countermobility
6-58. Depending on the enemy situation, countermobility may quickly become the priority of effort to help
defeat counterattacks against lodgment. Follow-and-support forces are normally used to secure lodgment
and defeat counterattacks. Therefore, engineers must—
� Anticipate the size of the counterattack force.
� Analyze likely AAs.
� Allocate the countermobility assets needed to disrupt or fix counterattack forces.
6-59. Engineer planners must design obstacle belts that permit the use of tactical and situational obstacles.
Normally, these obstacle belts are developed and passed to the battalions for planning, but are only active
on the order of the brigade commander. Forces securing lodgment require flexible, responsive obstacle
capabilities, such as SCATMINEs (Volcanos, Gators, Modular-Pack Mine Systems [MOPMs]) and
intelligent munitions.
Exploitation
6-60. Once the objective is secured, the engineer priority shifts to assisting the force in exploiting its
success by ensuring the mobility of the exploiting subordinate units. To facilitate the exploitation, the
ENCOORD must ensure that the scheme of engineer operations allows for rapid development of a lane
network within the penetration. The lane network must support the uninterrupted forward passage of the
reserve to subsequent objectives and the flow of sustainment to forces in the penetration. Once the force
has passed through the lanes, responsibility is passed to outside forces to improve and maintain the lane
network.
INFILTRATION
6-61. Infiltration (see figure 6-6, page 6-14) is a form of maneuver where the attacking force conducts
covert movement through or into an area occupied by enemy forces. This is done to occupy a position of
advantage in the enemy rear, while exposing only small elements to enemy defensive fires. This form of
maneuver is the preferred form of infantry maneuver because it permits a smaller force (not larger than a
battalion) to use stealth and surprise to attack a larger or fortified force. Infiltrations are normally carried
out on foot or by air, but they can be executed by selected vehicles or watercraft. Infiltration is most
feasible in the following instances:
� During limited visibility.
� Over rough terrain.
� Through areas unoccupied by the enemy.
� With dismounted elements.
� Through areas not covered by enemy observation and fire.
11 February 2009 FM 3-34.22 6-13