Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 98 4.5.5.2.6. Steel Hedgehogs. Hedgehogs are made using three pieces of angle iron 4 inches by 4 inches and approximately 4 feet long. The pieces are welded to a 4-inch steel plate (Figure 4.26). They can weigh up to 160 pounds. They are designed to rotate under vehicles and puncture or overturn them. They perform well in areas with high vegetation where they can be concealed. Exposed parts can be painted to blend with the terrain. Steel hedgehogs must be cabled together to be effective vehicle barriers. Figure 4.26. Steel Hedgehog.
AFH 10-222 Volume 14 1 August 2008 99 Chapter 5 REVETMENTS 5.1. Overview. Revetments are generally defined as raised walls or structures designed to provide protection against bombs, rockets, grenades, small arms fire, and the effects of blast and fragmentation. Revetments can be as simple as a wall of sandbags or as elaborate as major construction projects involving permanent, hardened revetments and aircraft shelters (Figure 5.1). Revetments of sufficient height can be used to provide full sidewall protection around open stores of critical equipment and material assets. Revetments can also function as obstacles to vehicles and other forms of possible intrusion. In the expeditionary environment, revetments are commonly composed of a soil berm and some type of structural material used as a retaining wall to hold back and stabilize the mass of earth. This type of revetment can be very effective against blast and fragmentation effects. This chapter covers the different types of revetments that can be used for a variety of purposes in the expeditionary environment. Figure 5.1. Various Types of Revetments.
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Civil engineer guide to fighting positions, shelters, obstacles

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