Table 8-2 lists the materials and man-hours required to assemble various entanglements. The normal sizes of work crews are listed in the descriptions of the entanglements. For each construction project, the senior petty officer divides his crew into groups of approximately equal size, based on his knowledge of the skill and the speed of each man. He organizes them in such a way that construction proceeds in proper order and at a uniform rate. Each individual must know exactly what his group is to do and his job in the group. Each man should have barbed wire gauntlets. The sequence of operations for each fence is given in the paragraph describing the erection of the fence. Follow the sequence outlined, and as you gain experience, you may vary the size and composition of the work groups. For each section of entanglement, all fence-building operations normally proceed from right to left, as one faces the enemy. It may, however, be necessary to work from left to right. Men should, as time permits, be taught to work in either direction. In case of heavy casualties, the senior officer or petty officer decides what wires, if any, are to be omitted.

Figure 8-13.-Ties for erecting entanglements as seen from the friendly side.

For night construction, make the following addi- tional preparations: 1. Lay tracing tape from the materials dump to the site of work and then along the line of fence where possible.

2. Tie materials together in man loads and pickets, bundled tightly to prevent rattling.

3. Remove and replace wire fastenings of wire coils and pickets with string that can be broken easily.

4. Tie a piece of tape to the ends of the wire on each reel or bobbin.

Proper supervision of entanglement construction includes the following:

1. Organizing the work into tasks

2. Ensuring the tasks are carried out in proper sequence

3. Preventing bunching and overcrowding of personnel

4. Ensuring the wires are tightened properly and spaced correctly

5. Checking ties to see they are being made correctly and at the right points

When the enemy is in close proximity, the necessary precautions include the following:

1. Providing security around the work party.

2. Maintaining silence.

Figure 8-14.-Top-eye tie.

Figure 8-15.-Intermediate-eye tie.

3. No working on the enemy side of the fence unless absolutely necessary.

4. Using screw pickets, when available.

5. Men that are not working should lie down near the start of work until they can continue their work

6. Keeping individual weapons nearby at all times.