Can’t concertina wire be easily cut with wire cutters?
I think that the wire is more of a “slow them down” barrier that needs to be augmented with folks watching and patrolling all the time.
From some military engineering manual on the net (so yes, wire by itself won’t do much):
“FOCDPIG” Regardless of the type of defense employed by the tactical commander, the seven basic employment principles for reinforcing obstacles are that reinforcing obstacles are:
F: Covered by Fire. The principal purpose of integrating obstacle location with fire is to enhance the effectiveness of these fires. With rare exceptions, obstacles that are not covered by fire are little more than a nuisance to the enemy.
O: Observed. It is imperative that all reinforcing obstacles are observed in order to maximize the use of available indirect fires on the enemy. In addition, obstacles should be placed in order to maximize the max effective range of various heavy, medium, and light direct fire weapons systems.
C: Concealed and employed for surprise. By varying the type, design, and location of the obstacle plan, the enemy’s understanding of our defensive scheme is made more difficult.
D:Employed in Depth. A series of simple obstacles arranged one behind the other along a probable axis of enemy advance is far more effective than one large, elaborate obstacle and forces the enemy to quickly attrite his organic engineering assets.
P: Protected by early warning and anti-handling devices. Incorporating these assets into reinforcing obstacles amplify detection of the enemy especially during times of little or no visibility.
I: Integrated with existing and other reinforcing obstacles that cannot be easily bypassed. It must support the maneuver commander’s plan. Reinforcing obstacles that do not accomplish one or more of the basic purposes of obstacles are of little value. Reinforcing obstacles must be planned and employed to support the tactical plan
G: Non-Geometric. By breaking up the outline of the obstacles/defense, the enemy is in the engagement area before he realizes it. This puts the enemy into a dilemma and makes him show his flank or belly.