Erebus-class monitor

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HMS Erebus
Class overview
Name	Erebus-class monitor
Builders	Harland and Wolff
Operators	Royal Navy
Preceded by	M29 class
Succeeded by	Roberts class
In service	1916 - 1946
In commission	August 1916
Completed	2
Lost	1
Scrapped	1
General characteristics
Type	Monitor
Displacement	8,000 tons (standard) 8,450 tons (full load)
Length	405 ft (123 m)
Beam	88 ft (27 m)
Draught	11 ft 8 in (3.56 m)
Propulsion	4 oil-fired boilers, 2 shaft reciprocating engines, 6,000 hp (4,500 kW)
Speed	12 knots (22 km/h; 14 mph)
Complement	204, rising to 315 later
Armament	Original: 2 × 15-inch /42 Mk 1 guns in a single turret 2 × single 6-inch (150 mm) guns 4 × single 3-inch (76 mm) anti-aircraft guns After refit: 2 × 15-inch /42 Mk 1 guns in a single turret 8 × single mount 4-inch (102 mm) BL Mk IX guns 2 × single mount 3-inch (76 mm) anti-aircraft guns 2 × quadruple .50-inch (12.7 mm) Vickers machine gun AA mounts
Armour	Belt and bulkheads: 4 inch Barbette: 8 inch Turret: 13 inch Deck: 4 inch Anti-torpedo bulges: 9 ft (2.7 m) wide

The Erebus class of warships was a class of 20th century Royal Navy monitors armed with a main battery of two 15-inch /42 Mk 1 guns in a single turret. It consisted of two vessels, Erebus and Terror, named after the two ships lost in the Franklin Expedition. Both were launched in 1916 and saw active service in World War I off the Belgian coast. After being placed in reserve between the wars, they served in World War II, with Terror being lost in 1941 and Erebus surviving to be scrapped in 1946.