Because barbed wire made an obsticle to movement. Clothing & equipment would become entangled and need to be freed to allow attacking forces to get to grips with the enemy. If a Russian got caught in the barbed wire he would most likely scream, so they would know he was there. Warfare had changed since the Generals were in Staff College and the Artillery Shell and the Machine Gun reaped terrible harvests. I'm not suggesting that artillery & machine guns were new to warfare, they were not, just that their improvement was unrecognised or appreciated. The idea of charging across no mans land armed with nothing but a bayonet. well, someone thought it was a viable prospect, but then he sat on a horse & drank brandy and thought himself important. One backfire to it was that if a rabbit or other small creature got stuck and started to screech they would blow it to shreds for no reason, therefore wasting their ammo. The soldiers would tell the commander of general that "They got bored after 4 days with nothing to shoot"
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The reason for using barbed wire has remained the same, whenever and wherever it's been used - to create an obstacle, a barrier. String it out, and anyone coming that way will either be slowed down or stopped outright.
In war time, this give the people on the other side of the barbed wire obstacle time to fire at the would-be attackers.
It was used as an effective tool to prevent motion with deadly consequences. Barbed wire entanglements were placed in front of trenches to prevent direct charges on men below
The purpose of the barbed wire in front of the trenches was that it slowed down the enemy and gave the machine gunnars a chance to kill them.
Barbed wire was used to keep the trench enemies away from the soldiers in case they come for attack.
Modern weapons such as trench warfare, machine guns, barbed wire, and poison gas!
To keep catle on the ranch.
barbed wire was invented on October 27,1873
Barbed wire is used as a defensive obstacle that prevents enemy soldiers from attacking an army's position. Barbed wire injures soldiers and entangles their clothes in order to slow their advance. During World War I, armies created several bands of barbed wire defenses that prevented their enemies from launching successful infantry attacks. Because armies at the time were composed primarily of infantry, the use of barbed wire helped create a military stalemate between the Allies and the Central Powers. Its importance as a military defense declined when armies began using airplanes and tanks, which are not affected by barbed wire.