The Tyne Turrets were two 12-inch Mk VIII guns

BL 12 inch naval gun Mk VIII

The BL 12 inch naval gun Mark VIII was one of the first large British naval guns designed for the higher pressures generated by the new cordite propellant, and Britain's first large wire-wound gun...

 from the battleship

Battleship

A battleship is a large armored warship with a main battery consisting of heavy caliber guns. Battleships were larger, better armed and armored than cruisers and destroyers. As the largest armed ships in a fleet, battleships were used to attain command of the sea and represented the apex of a...

 HMS Illustrious

HMS Illustrious (1896)

The third HMS Illustrious of the British Royal Navy was a Majestic-class pre-dreadnought battleship launched in 1896. She was in front-line service during the final years of the 19th century and early 20th century...

, installed in Roberts Battery at Hartley

Hartley, Northumberland

 Hartley is a historic village in Northumberland, England. The village lies on the A193 road south of Blyth and 4 miles north of Tynemouth. It was a farming and later colliery village but today is part of Seaton Sluice. However it has given its name to the ward of Hartley which covers Seaton...

, near Seaton Sluice north of the Tyne

River Tyne

The River Tyne is a river in North East England in Great Britain. It is formed by the confluence of two rivers: the North Tyne and the South Tyne. These two rivers converge at Warden Rock near Hexham in Northumberland at a place dubbed 'The Meeting of the Waters'.The North Tyne rises on the...

, and Kitchener Battery in Marsden

Marsden, Tyne and Wear

Marsden is a suburb in South Shields, North East England, located on the North Sea coast.The original village of Marsden, was demolished in the 1960s due to the risk of erosion from the encroaching shoreline. What remains are five rows of Victorian terraced houses, which were originally built to...

 near Lizard Point south of the river. The batteries were planned in World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 but only commissioned in 1921, and after a change of heart scrapped in 1926. This very heavy armament was only rivalled by the Dover

Dover

Dover is a town and major ferry port in the home county of Kent, in South East England. It faces France across the narrowest part of the English Channel, and lies south-east of Canterbury; east of Kent's administrative capital Maidstone; and north-east along the coastline from Dungeness and Hastings...

 harbour Admiralty Pier Turret

Admiralty Pier Turret

The Admiralty Pier Turret or Dover Turret, is an enclosed armoured turret built in 1882 on the western breakwater of Dover Harbour in southeast England. It contains 2 Fraser RML 16 inch 80 ton guns, the biggest installed in the United Kingdom...

at the time.