Does barbed wire really count as a weapon? It should, because it was used to great effect for the first time in World War I as a defensive weapon on the Western Front. Barbed wire would snag (and hold ) onto everything from clothing to equipment to human skin and flesh. Once soldiers would become caught in the wire, they would be easy targets for machine gun, mortar, and sniper fire.
Barbed wire would often be deployed strategically, with multiple layers of it sprawled out across many miles. Alternatively, it would be arranged more intricately, such as with a small gap or two in the line for the attacking force would feel compelled to charge through, only to be met with a concentrated hail of defensive fire.