Operation Grog was the name assigned to the British naval and air bombardment of Genoa and La Spezia on 9 February 1941, by a fleet consisting of HMS Malaya, HMS Ark Royal, HMS Renown and HMS Sheffield, screened by ten fleet destroyers including HMS Fearless, HMS Foxhound, HMS Foresight, HMS Fury, HMS Firedrake and HMS Jersey.
The operation was originally scheduled to start on 31 January 1941, but the ships didn't leave Gibraltar until 6 February.
Genoa harbour was bombarded on 9 February, with the force sinking four cargo ships and damaging 18. A salvo from HMS Malaya landed between 200 and 50 yards short of the battleship Caio Duilio, undergoing repairs in dry dock north of Molo Giano; no damage was reported on the Italian battleship. A targeting error by a gunnery officer on board HMS Malaya some thirteen miles offshore caused an armour-piercing round to hit Genoa Cathedral; the shell failed to explode and remains on display there.
- Lt Cdr Geoffrey B Mason RN (Rtd). "SERVICE HISTORIES of ROYAL NAVY WARSHIPS in WORLD WAR 2:HMS RENOWN - Renown-class 15in gun Battlecruiser". Naval-History.Net. Retrieved 9 July 2010.
- Lt Cdr Geoffrey B Mason RN (Rtd). "SERVICE HISTORIES of ROYAL NAVY WARSHIPS in WORLD WAR 2:HMS Fearless(H67)". Naval-History.Net. Retrieved 9 July 2010.
- "UK Battleship of WW1 and WW2:HMS Malaya (BB-6)". Retrieved 10 July 2010.
- Brown, David (2002). The Royal Navy and the Mediterranean: September 1939-October 1940. Routledge, p. 51. ISBN 0714652059
- "Obituary:Commander Henry Hatfield". Daily Telegraph. 4 July 2010. Retrieved 5 July 2010.
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