Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 76 4.4.2.3. Log Cribs. Log cribs are simple obstacles consisting of short sections of logs (or other materials such as steel planks if available) fashioned together as bins to contain dirt or rocks. Log cribs can be rectangular or triangular and are used to block vehicle paths of travel on narrow roads (Figure 4.5). When possible, fill the cribs with material excavated by digging a shallow ditch in front of the cribs. Anchor revetment materials to prevent them from being easily pushed out of the way. These obstacles are effective against wheeled and tracked vehicles, especially in restricted areas like narrow mountain roads. Unless substantially built, these types of obstacles are not effective against heavy tracked vehicles. To make these obstacles more effective, log hurdles can be constructed ahead of the cribs to force vehicles to slow down prior to encountering them. Figure 4.5. Log Cribs.
AFH 10-222 Volume 14 1 August 2008 77 4.4.3. Expedient Posts. The next few paragraphs cover different types of posts that can be used to block access roads either permanently or temporarily. The method used will depend on many factors, including the need for access by friendly forces, the threat, availability of equipment and materials, and the need to maintain an active offensive and defensive capability. 4.4.3.1. Timber Posts. Timber posts can be used to stop vehicles if partially buried and driven into the soil at an angle between vertical and 50 degrees toward the direction of movement (Figure 4.6). The posts should be approximately 10 feet long and extend 3 1/2 to 4 feet aboveground. Set the posts between 3 to 4 feet apart in rows with 10 feet between rows. They can be either aligned or staggered. Logs should be a minimum of 5 inches in diameter for hardwoods and about 10 inches in diameter for softwoods. Wire entanglements can be used in conjunction with this measure for increased effectiveness. Figure 4.6. Timber Posts.
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Civil engineer guide to fighting positions, shelters, obstacles

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