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HMS Sirius (1890)
HMS ''Sirius'' was an of the British Royal Navy which served from 1892 to 1918 in various colonial posts such as the South and West African coastlines and off the British Isles as a hastily converted minelayer during the First World War. In April 1918, ''Sirius'' was deliberately scuttled in the mouth of Ostend harbour in Belgium during the failed First Ostend Raid. This operation was intended to block the harbour mouth and prevent the transit of German U-boats and other raiding craft from Bruges to the North Sea. German countermeasures were however too effective, and ''Sirius'' and her fellow blockship were eventually destroyed by their crews outside the harbour mouth after running aground on a sandbank. The wrecks were broken up after the war.
==Design and construction==
The Naval Defence Act 1889 resulted in orders being placed for 21 second-class protected cruisers of the , of which, two, HMS ''Sirius'' and , were ordered from Armstrong's Elswick shipyard.〔Brook 1999, pp. 74–75.〕
''Sirius'' had an overall length of a beam of and a draught of . Displacement was . She was one of 10 ships of the class that was sheathed in wood and copper to reduce fouling. An armoured deck of between and protected the ship's magazines and machinery, while the ship's conning tower had of armour and the gunshields . Two were mounted fore and aft on the ship's centreline, while six 4.7 in (120 mm) guns were mounted three on each broadside. 8 six pounder guns and 1 three pounder provided protection against torpedo boats.〔
''Sirius'' was laid down in September 1889, launched on 27 October 1890〔 and entered service in September 1891.〔Brook 1999, p. 74.〕
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