with the intermediate-eye tie and is stretched tightly to
prevent passage over or under it.
5. Wire Nos. 6, 7, and 8 complete the center portion
of the fence and are secured to the long pickets Nos. 6
and 7 with the intermediate-eye tie. They also start at the
first and end at the last, long picket. No. 8 is secured with
the top-eye tie. These wires (Nos. 6,7, and 8) form the
backbone of the fence and are drawn up tightly to hold
the pickets in position.
6. Wire No. 9 is the diagonal apron wire on the
friendly side of the fence and is secured with the top-eye
tie to all pickets. Wire Nos. 10 and 11 are apron wires,
and wire No. 12 is the trip wire on the friendly side of
the fence. Wire No. 12 is installed in the same manner
as wire No. 2.
7. If the fence is not satisfactorily tight when
installed, wires are tightened by racking as described
STANDARD CONCERTINA FENCE
As an obstacle, inmost situations, the triple standard
concertina fence is better than the double-apron fence.
The material for it weighs about 50 percent more, but it
is erected with about one half of the man-hours. Every
concertina fence is secured firmly to the ground by
driving staples at intenvals of not more than 6.6 feet. The
staples are used on the single concertina fence and on
Figure 8-22.--Sequence of installing wire in a double-apron
the front concertina of the double and triple types. The
two types of fence areas follows:
1. SINGLE CONCERTINA. This is one line of
2. The No. 2 wire is the trip wire on the enemy side
concertinas. It is erected quickly and easily but is not an
of the fence and is secured to both diagonals just above
effective obstacle in itself. It is used as an emergency
the anchor picket with the apron tie. This wire must be
entanglement or for the temporary closing of gaps
tight enough and close enough to the ground to make
between other obstacles. It is for such purposes that one
roll of concertina maybe habitually carried on the front
passage over or under the wire difficult.
of each vehicle in combat units.
3. The No. 3 wire is an apron wire on the enemy
2. DOUBLE CONCERTINA. This consists of a
side of the fence. It is secured to the first diagonal wire,
double line of concertinas with no intend between
and thereafter to each alternate diagonal, and then to the
lines. The two lines are installed with staggered joints.
last diagonal wire. The No. 4 wire is also an apron wire
As an obstacle, the double concertina is less effective
on the enemy side of the fence. It is secured to the first
than a well-emplaced, double-apron fence. It is used in
diagonal wire (No. 1), thereafter to the diagonal wires
some situations to supplement other obstacles in a band
which are not tied to the No. 3 wire, and then to the last
diagonal wire. Apron wire Nos. 3 and 4 are equally
spaced along the diagonal wire.
TRIPLE STANDARD CONCERTINA FENCE
4. The No. 5 wire is the first one that is not started
from the end anchor picket. It is started at the first, long
This fence consists of two lines of concertinas
picket and ended at the last, long picket. It is secured
serving as a base, with a third line resting on top, as