Chapter 2. COUNTERMOBILITY FUNDAMENTALS. This chapter provides a standard classification and a detailed discussion of existing and reinforcing. Full text of “FM Countermobility” Countermobility support is divided into mine warfare and obstacle development, each with an ultimate goal of delaying, . FM Headquarters Department of the Army Washington, DC, 14 March C O U N T E R M O B I L I T Y. he foundation for engineer doctrine in .

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Responsive communication, timely intelligence, and rapid decision making are keys to successful obstacle employment after the battle has begun. Preconstructed obstacles are generally of the following types:. Bangalore torpedoes are also used.

Tactics of enemy combined arms forces are designed around the mobility of tanks. Engineer reconnaissance of water crossings In the threat view, the key to a successful river crossing is thorough reconnaissance to determine both the tactical situation and the technical characteristics of the river and its banks.

It is a function of soil type and condition, and ditch width and depth. Their complexity depends upon the time and personnel available. Brigade, battalion, and other commanders plan and execute denial targets as they are assigned missions in combat plans and orders. Reserved demolition obstacles are critical to the tactical commander’s plan, and require a formal written demolition order. Each individual obstacle must be carefully designed for the exact location it will occupy, and must overlap on each side with the existing obstacle it will complete.

The tendency of ice to shatter more readily than soil should be considered when charges are computed. Demolitions are stored nearby to blow the concrete block supports when the appropriate alert measure has been received and the tactical situation permits. Here again, the use of plow-and roller-equipped tanks is not an engineer responsibility, but an engineer function carried out by tank soldiers. Fully dependable criteria pertaining to the size of trees, and the significance of species and root systems, have not been determined.


Basic production data of estimated construction times is shown for a 1. Engineer terrain analysis teams will provide information on the use of terrain in denial operations such as defining flood boundaries. Crossing preparation and execution Following the initial site preparation, and immediately prior to actual crossing, final preparatory activities are executed.

FM 5-102 Countermobility

Reinforcing obstacles are limited only by imagination, time, manpower, or logistic constraints. The location is based upon good military obstacle location techniques.

The “who” portion and accompanying task organization allocates resources to do the job. After the ditch is constructed, and if time permits, the berm can then be further shaped. Road craters must be large enough to tie into natural or man-made obstacles at each end.

Route preparation of approaches to crossing points will follow the same procedures as in the approach march. A target folder with all pertinent information will be prepared by the military region command in whose area the obstacle is located. They should be located within the effective range of friendly direct fire antitank weapons. A steep cross-slope also makes it more difficult for the gunner to rapidly deliver accurate fire, thus giving the defender a relative advantage.

The attacking force crosses the water obstacle in stride, does not stop to consolidate bridgeheads, and continues the advance without pausing.

Countermobility on the Battlefield

Reserve obstacles must be carefully selected. Frequently, it is more desirable to slow but not stop him.

A good analysis of the terrain in the areas of influence and 5-1002 should answer the following questions: The critical design width of an obstacle is the distance from an existing obstacle to another existing obstacle or to another reinforcing obstacleand not the width of a road or highway through the existing obstacle. An analysis of recent wars shows that effective and well-planned integration of countermobility activities and firepower can enable an outnumbered force to win.

Breaching and clearing mines. Counterreconnaissance, which prevents the counteemobility of engineer reconnaissance missions, deprives the threat commander of information vital to the successful execution of attack.


This is a particularly important role in view of the threat doctrine of penetration and envelopment, and the overall dispersion of forces on the battlefield. The tank’s weight magnifies the effect of even a slight rise by reducing contermobility speed. The M2A4 shaped charges may be used effectively to blast cratering charge boreholes in reinforced concrete pavement of less than 6-inch thickness laid on thin base courses, or to blast boreholes in unpaved roads.

In mountainous areas, the steep slopes commonly make cross-country vehicular movement either difficult or impossible. Methods, materials, and equipment span the same spectrum. The combination of soft or slippery soils, and even slight slopes, will stop many vehicles. The use of ADM for stream cratering is infrequent; however, countermobilkty great cratering capability of ADM makes stream diversion possible to create obstacles where the enemy least expects them.

Obtaining the necessary information, however, is difficult and time-consuming; and, properly evaluating trafficability strength of soils is countermobiliry complicated process.

FM Countermobility – Chptr 2 Countermobility Fundamentals

The routes leading countermobklity a start line to each lane are marked with red triangular metal flags and black-and-white tapes. For these reasons, site preparation represents the most vulnerable aspect of a threat river crossing. The type of the material composing the banks may be significant.

When providing flank protection. They can be used in the economy of force role to strengthen a naturally strong existing obstacle area so that it need only be lightly defended, thus freeing forces to be concentrated elsewhere.

It clears a lane about meters long by 6 to 8 meters wide. The obstacle value of a cultural feature depends on its size or extent, location, and construction.