Barbed wire was originally used by the British in 1888. Their army manuals included how to effectively lay barbed wire. After the First Battle of Marne barbed wire appeared in the trenches on both sides of No Man's Land.
-“One expert estimated that by 1918, at least a million miles of the stuff had been strung throughout Flanders alone – enough to circle the earth 40 times.”
https://militaryhistorynow.com/2014/01/08/barbed-wire-war-how-one-farmers-innovation-changed-the-battlefield/
-“One expert estimated that by 1918, at least a million miles of the stuff had been strung throughout Flanders alone – enough to circle the earth 40 times.”
https://militaryhistorynow.com/2014/01/08/barbed-wire-war-how-one-farmers-innovation-changed-the-battlefield/