HMS Erebus (I02)
Overview
 

HMS Erebus was a 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...

 monitor launched on 19 June 1916 and served in both world wars. She and her sister HMS
Terror
HMS Terror (I03)
HMS Terror was an Erebus-class monitor built for the Royal Navy in 1915-16 at the Harland and Wolff shipyard in Govan, Scotland.The Erebus-class monitors were of displacement, long, with a maximum speed of produced by reciprocating engines with two shafts, and a crew of 223. The ship's main...

 are known as the
Erebus class
Erebus class monitor
The Erebus class of monitors of the Royal Navy consisted of two ships: HMS Erebus and HMS Terror.* HMS Erebus was built by Harland and Wolff, Govan. She was laid down 12 October 1915, launched on 19 June 1916 and commissioned in September 1916...

. They were named for the two bomb ketches sent to investigate the Northwest Passage
Northwest Passage
The Northwest Passage is a sea route through the Arctic Ocean, along the northern coast of North America via waterways amidst the Canadian Arctic Archipelago, connecting the Atlantic and Pacific Oceans...

 and subsequently lost in 1845.

Monitors were designed as stable gun platforms with a shallow draft
Draft (hull)
The draft of a ship's hull is the vertical distance between the waterline and the bottom of the hull , with the thickness of the hull included; in the case of not being included the draft outline would be obtained...

 to allow operations close inshore in support of land operations and were not intended to contest naval battles.
 
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