Admiralty scaffolding, also known as Obstacle Z.1 or sometimes simply given as beach scaffolding [1] or anti-tank scaffolding, [2] was a British design of anti-tank and anti-boat obstacle made of tubular steel. It was widely deployed on beaches of southern England, eastern England and South West England during the invasion crisis of 1940-1941. [3] [4] Scaffolding was also used, though more sparingly, inland. [5]
Of a number of similar designs, by far the most common was designated obstacle Z.1. This design comprised upright tubes 9 feet (2.7 m) high and 4 feet 10 inches (1.5 m) apart, these were connected by up to four horizontal tubes. Each upright was braced by a pair of diagonal tubes, at about 45°, to the rear. [6] 20-foot (6 m) wide sections were assembled then carried to the sea to be placed in position at the half tide mark as an obstacle to boats. [6]
However, trials found that a 250-ton barge at 5+1⁄2 knots (6.3 mph; 10.2 km/h) or an 80-ton trawler at 7+1⁄2 knots (8.6 mph; 13.9 km/h) would pass through the obstacle as if it were not there and a trawler easily pulled out one bay with an attached wire rope. [7] Tests in October 1940, confirmed that tanks could only break through with difficulty, as a result Z.1 was adopted as an anti-tank barrier for beaches thought suitable for landing tanks. As an anti-tank barrier it was placed at or just above the high water point [6] where it would be difficult for tanks to get enough momentum to break through the barrier. In some places, two sets of scaffolding were set up, one in the water against boats and one at high water against tanks. [8]
The problem of securing the barriers on sand was overcome by the development of the "sword picket" by Stewarts & Lloyds – this device was later known at the Admiralty as the "Wallace Sword". [7] [9]
Barriers varying in length from a couple of hundred feet to three miles were constructed consuming 50% of Britain's production of scaffolding steel [6] at an estimated cost of £6,600 per mile [6] (equivalent to £380,000 today [10] ). Despite this, many miles of Admiralty scaffolding were erected using more than 15,000 miles (24,000 km) of scaffolding tube. [9]
After the war, the scaffolding got in the way of swimmers, [11] [12] subsequently it was removed for scrap and remaining traces are very rare, but occasionally revealed by storms. [13] [14] [15] [16] [17]
The Taunton Stop Line was a World War II defensive line in southwest England. It was designed "to stop an enemy's advance from the west and in particular a rapid advance supported by armoured fighting vehicles which may have broken through the forward defences."
Chesil Beach in Dorset, England is one of three major shingle beach structures in Britain. Its name is derived from the Old English ceosel or cisel, meaning "gravel" or "shingle". It runs for a length of 29 kilometres (18 mi) from West Bay to the Isle of Portland and in places is up to 15 metres (50 ft) high and 200 metres (660 ft) wide. Behind the beach is the Fleet, a shallow tidal lagoon. Both are part of the Jurassic Coast and a UNESCO World Heritage Site, and together form an SSSI and Ramsar Site.
Walberswick is a village and civil parish on the Suffolk coast in England. It is at the mouth of the River Blyth on the south side of the river. The town of Southwold lies to the north of the river and is the nearest town to Walberswick, around 1 mile (1.6 km) away. Walberswick is around 11 miles (18 km) south of Lowestoft on the North Sea coast. It is 7 miles (11 km) east of Halesworth and 28 miles (45 km) northeast of the county town of Ipswich.
The Royal Military Canal is a canal running for 28 miles (45 km) between Seabrook near Folkestone and Cliff End near Hastings, following the old cliff line bordering Romney Marsh, which was constructed as a defence against the possible invasion of England during the Napoleonic Wars.
Bawdsey is a village and civil parish in Suffolk, eastern England. Located on the other side of the river Deben from Felixstowe, it had an estimated population of 340 in 2007, reducing to 276 at the Census 2011.
Cuckmere Haven is an area of flood plains in Sussex, England where the river Cuckmere meets the English Channel between Eastbourne and Seaford. The river is an example of a meandering river, and contains several oxbow lakes. It is a popular tourist destination with an estimated 350,000 visitors per year, where they can engage in long walks, or water activities on the river. The beach at Cuckmere Haven is next to the famous chalk cliffs, the Seven Sisters.
Winterton-on-Sea is a village and civil parish on the North Sea coast of the English county of Norfolk. It is 8 miles (13 km) north of Great Yarmouth and 19 miles (31 km) east of Norwich.
Druridge Bay is a 7-mile (11 km) long bay on the North Sea in Northumberland, England, stretching from Amble in the north to Cresswell in the south.
Dragon's teeth are square-pyramidal fortifications of reinforced concrete first used during the Second World War to impede the movement of tanks and mechanised infantry. The idea was to slow down and channel tanks into killing zones where they could easily be disposed of by anti-tank weapons.
British anti-invasion preparations of the Second World War entailed a large-scale division of military and civilian mobilisation in response to the threat of invasion by German armed forces in 1940 and 1941. The British Army needed to recover from the defeat of the British Expeditionary Force in France, and 1.5 million men were enrolled as part-time soldiers in the Home Guard. The rapid construction of field fortifications transformed much of the United Kingdom, especially southern England, into a prepared battlefield. Sea Lion was never taken beyond the preliminary assembly of forces. Today, little remains of Britain's anti-invasion preparations; only reinforced concrete structures such as pillboxes and anti-tank cubes are commonly found.
British hardened field defences of World War II were small fortified structures constructed as a part of British anti-invasion preparations. They were popularly known as pillboxes, a reference to their shape.
Freiston Shore is a settlement in the Borough of Boston, in Lincolnshire, England. It is in the civil parish of Freiston, and approximately 4 miles (6 km) east from Boston.
The Ringwood West Line was a World War II defensive line in England, running south from the GHQ Line near Frome to the coast.
The Canadian pipe mine, also known as the McNaughton tube, was a type of landmine deployed in Britain during the invasion crisis of 1940–1941. It comprised a horizontally bored pipe packed with explosives, and once in place this could be used to instantly create an anti-tank obstacle or to ruin a road or runway thereby denying its use by an enemy.
The Ruck machine gun post or Ruck pillbox is a type of hardened field fortification built in Britain during the invasion crisis of 1940–1941. It was designed by James Ruck and was made from prefabricated concrete sections and paving slabs, sandbags and rammed earth. The Ruck machine gun post was relatively widely used in Lincolnshire and along the east coast of England, but is now extremely rare with just a handful of extant examples. Today, just five Ruck machine gun post sites are recorded in the Defence of Britain database.
Buoy is a British type of anti-tank obstacle used to block roads intended to impede enemy movement. Buoys were widely deployed during the invasion crisis of 1940–1941. Each buoy was a truncated cone of concrete with a rounded bottom, about 2 feet 9 inches (84 cm) high, and with a 2 inches (50 mm) diameter hole through the axis. They would be placed in at least five rows across a roadway.
The Norcon pillbox is a type of hardened field fortification built in Britain during the invasion crisis of 1940–1941. It was a small circular pillbox named after the company that manufactured it as a private commercial venture.
The Tett turret is a type of hardened field fortification built in Britain during the invasion crisis of 1940–1941. It was a small circular pillbox named after its inventor H.L. Tett and manufactured as a private commercial venture by Burbridge Builders Ltd of Surrey. It comprised a revolving concrete turret mounted on a ball race that allowed it to be turned easily. The turret was set above a pit; in early designs, the pit was formed by a standard section of concrete pipe 4 feet (1.2 m) in diameter.
A pillbox is a type of blockhouse, or concrete dug-in guard-post, normally equipped with loopholes through which defenders can fire weapons. It is in effect a trench firing step, hardened to protect against small-arms fire and grenades, and raised to improve the field of fire.
A Pickett-Hamilton fort is a type of hardened field fortification built in Britain during the invasion crisis of 1940–1941. The Pickett-Hamilton fort was designed to be lowered into the ground while it was not in use, to become inconspicuous and not interfere with the passage of taxiing aircraft or other vehicles. The fort could be raised to about 2 feet 6 inches (0.76 m) above ground level where it would be a physical impediment to aircraft and vehicles and from where a small crew could fire with rifles or light machine guns.
