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Concertina wire or Dannert wire [1] is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina. In conjunction with plain barbed wire (and/or razor wire/tape ) and steel pickets , it is most often used to form military-style wire obstacles .
Depending on the requirements and available resources, wire obstacles may range from a simple barbed wire fence in front of a defensive position, to elaborate patterns of fences, concertinas, "dragon's teeth" (which serve a similar purpose as wire obstacles, but for combat vehicles instead) and minefields (both anti-personnel and anti-armor ...
Barbed wire obstacles had been enlarged from one belt 5–10 yd (4.6–9.1 m) deep to two belts 30 yd (27 m) deep and about 15 yd (14 m) apart. Double and triple thickness wire was used and laid 3–5 ft (0.91–1.52 m) high.
The wire-cutting No. 106 fuze was developed, specifically designed to explode on contact with barbed wire, or the ground before the shell buried itself in mud, and equally effective as an anti-personnel weapon; The first anti-aircraft guns were devised out of necessity; Germany was far ahead of the Allies in using heavy indirect fire.
Barbed wire, also known as barb wire, is a type of steel fencing wire constructed with sharp edges or points arranged at intervals along the strands. Its primary use is the construction of inexpensive fences , and it is also used as a security measure atop walls surrounding property.
The Germans had built Riegel I Stellung (Reserve Position I), a double line of trenches and barbed-wire several miles further back from Essarts to Bucquoy, west of Achiet-le-Petit, Loupart Wood, south of Grévillers, west of Bapaume, Le Transloy to Sailly-Saillisel as a new second line of defence along the ridge north of the Ancre valley. [1]
Dugouts were caved in, barbed-wire entanglements were vapourised and trenches obliterated. German infantry took to occupying shell-holes in two- and three-man teams, about 20 yd (18 m) apart. Supporting and reserve units further back used shell-holes and any cover that could be found for shelter.
Mother was successfully demonstrated to the Landship Committee in early 1916; it was run around a course simulating the front including trenches, parapets, craters and barbed wire obstacles. The demonstration was repeated on 2 February before the cabinet ministers and senior members of the Army.