Later converted to a minelayer and renamed HMS Medea, she was wrecked whilst being towed for breaking up on 2 January 1939.

Intended as a shore bombardment vessel, M22's primary armament was a single 9.2 inch Mk VI gun removed from the Edgar-class cruiser HMS Gibraltar.

HMS M22 ordered in March, 1915, as part of the War Emergency Programme of ship construction.

She was laid down at the Sir Raylton Dixon & Co. Ltd shipyard at Govan in March 1915, launched on 10 June 1915, and completed in August 1915.

After service in the Black Sea from June to September 1919, M22 was towed home and converted to a minelayer in 1920.