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Instructions The following items will test your understanding of the material covered in this lesson. Print this page and compare it with the solutions that will be found at the end of this exercise. If you do not understand an answer, review the portion of the instructional material which provides the information.

1.   In which use of barbed wire is each series of concertinas placed about 10 meters in depth?

  2.   How many more meters of barbed wire are on a full reel than are put on a bobbin?

  3.   What advantage does barbed tape have over standard barbed wire?

  4.   Why are the U-shaped steel pickets used to support wire entanglements emplaced with the hollow surface (concave side) facing enemy fire?

  5.   In which direction should fence-building operations normally proceed?

  6.   How and why are the ends of the wire on bobbins marked?

  7.   When a standard barbed wire concertina is being collapsed for transportation or storage, what keeps the bottom of the wire coil from fanning out?

  8.   Which kind of picket is recommended for the construction of wire entanglement in combat areas in close proximity to the enemy?

  9.   In the construction of barbed wire entanglements, which tie is used to join two wires that cross?

  10.   In the construction of a four-strand cattle fence, which fence construction team installs the third strand from the top?

  11.   What size unit is normally assigned the task of constructing a 300-meter section of double-apron fence?

  12.   Which wires (numbered in sequence of installation) form the backbone of a double-apron fence?

  13.   What does wire No. 12 of a double-apron fence have in common with wire No. 2?

  14.   After the pickets for a triple concertina fence have been installed, where is the first roll of concertina placed by the personnel that lay out the wire?

  15.   Why is a strand of barbed wire stretched tightly along the top of front row concertina sections in the construction of a triple standard concertina fence?

  16.   What barbed wire obstacle is used equally well in snow, rocky ground, or marshland?

  17.   Which barbed wire obstacle is constructed about 23 centimeters above the ground?

Situation:   Given perimeter defense:
Tactical wire mean perimeter = 800 meters
Protective wire mean perimeter = 600 meters
Supplementary wire mean perimeter = 1000 meters
(See figure 4-36)

18.   Estimate the amount of material, the truckloads, and the manhours required to construct one band (three belts in depth) of tactical wire using 4 and 2 pace double apron design. The fence will be constructed during daylight hours by inexperienced troops using U-shaped pickets and barbed tape.

19.   Estimate the amount of material, the truckloads, and the manhours required to construct one belt of triple standard concertina for protective wire. The fence will be constructed during the daylight hours by experienced troops using U-shaped pickets and barbed wire.

Figure 4-36.  Base camp (perimeter) defense.

Figure 4-36.   Base camp (perimeter) defense.


Answer Key