Temporary and Permanent Obstacles for Retreat Security
At least two or three times a year, I have consulting clients ask me about anti-personnel and anti-vehicular obstacles. In heavily-wooded country, dropping some trees to form an abatis (as shown in this illustration from US Army Field Manual FM 90-7) is a viable expedient. But keep in mind that obstacles often work both ways. they will keep the bad guys out, but also keep you in. That is why my favorite roadblock is a Caterpillar (“Cat”) or similar tracked tractor, parked perpendicular at a narrow spot on a road, with its blade dropped and ignition system disabled. That will …