HMS M21

HMS M21 was a First World War Royal Navy M15-class monitor. After service in the Mediterranean and the Dover Patrol, she struck a mine off Ostend in January 1918 and sank off Dover.

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Wikidata
M15-class monitor, monitor, Royal Navy, United Kingdom of Great Britain and Ireland, 

• Dreadnought Project page^@
​ ​

Location: KML, Cluster Map, Maps,

1915-05-27T00:00:00Z

1915-05-27T00:00:00Z

ship launching

1915-03-01T00:00:00Z

1915-03-01T00:00:00Z

keel laying

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Frameless

Type	Subtype	Date	Description	Notes	Source
link	page		Dreadnought Project page@		Wikidata