The four-strand center section of a double-apron fence can be installed rapidly to obtain some obstacle effect. The aprons can be added later to develop it into a double-apron fence. In country where wire fences are used by farmers, obstacles in the form of four-strand cattle fences (fig. 8-19) will blend with the landscape. Their design should follow the local custom as closely as possible, usually wooden pickets at about 2- to 4-pace intervals with four horizontal strands of barbed wire fixed to them. Site them along footpaths and edges of fields or crops where they do not look out of place. When conditions permit, you may improve this fence by installing guy wires in the same manner as the diagonal wires of the

Figure 8-19.-Four-strand cattle fence as viewed from the enemy side.

double-apron fence. All longitudinal wires of this fence must start and end at an anchor picket.

Phase One

Use 8 men on short sections of this fence and up to 16 men on 984-foot sections. The two operations are (1) laying out and installing pickets and (2) installing wire.

Divide the working party into two groups of approximate y equal size. The first group carries and lays out long pickets at 9.8-foot intervals along the center line of the fence. They begin and end the section with an anchor picket and include anchor pickets for guys, if needed. The second group installs the pickets.

Phase Two

As the first task is completed, move men individually to the head of the fence and organize them into teams of two or four men to install the wires. For four-man teams, two men carry the reel and two men make ties and pull the wire tight. For two-man teams, the wire must first be urolled for 164 to 328 feet; then the men come back to the head of the work and make the ties, or the wire may first be made up into bobbins to be carried and unwound by one man, while the other man makes the ties. The first team installs the bottom fence wire and draws it tight and close to the ground. Succeeding teams install the next wires in order.