Operation Grog was the code name name for the British naval and air bombardment of

Genoa Genoa ( ; ; ) is a city in and the capital of the Italian region of Liguria, and the sixth-largest city in Italy. As of 2025, 563,947 people live within the city's administrative limits. While its metropolitan city has 818,651 inhabitan ...

and

La Spezia La Spezia (, or ; ; , in the local ) is the capital city of the province of La Spezia and is located at the head of the Gulf of La Spezia in the southern part of the Liguria region of Italy. La Spezia is the second-largest city in the Liguria ...

on 9 February 1941, by Force H of the

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

, consisting of the

battleship A battleship is a large, heavily naval armour, armored warship with a main battery consisting of large naval gun, guns, designed to serve as a capital ship. From their advent in the late 1880s, battleships were among the largest and most form ...

, the

aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...

, the

battlecruiser The battlecruiser (also written as battle cruiser or battle-cruiser) was a type of capital ship of the first half of the 20th century. These were similar in displacement, armament and cost to battleships, but differed in form and balance of att ...

and the

light cruiser A light cruiser is a type of small or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck. Prior to thi ...

screened by ten fleet

destroyer In naval terminology, a destroyer is a fast, maneuverable, long-endurance warship intended to escort larger vessels in a fleet, convoy, or carrier battle group and defend them against a wide range of general threats. They were conceived i ...

s including , , , , and .

Events

The operation was originally scheduled to start on 31 January 1941, but the ships did not leave

Gibraltar Gibraltar ( , ) is a British Overseas Territories, British Overseas Territory and British overseas cities, city located at the southern tip of the Iberian Peninsula, on the Bay of Gibraltar, near the exit of the Mediterranean Sea into the A ...

until 6 February. Four destroyers carried out an anti-submarine sweep while the heavy ships carried out a feint to deceive Axis observers into thinking they were supporting a

convoy A convoy is a group of vehicles, typically motor vehicles or ships, traveling together for mutual support and protection. Often, a convoy is organized with armed defensive support and can help maintain cohesion within a unit. It may also be used ...

harbour was bombarded on 9 February 1941, with the force sinking four

cargo ship A cargo ship or freighter is a merchant ship that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's List of seas, seas and Ocean, oceans each year, handling the bulk of international trade. ...

s and damaging 18 more. A majority of Italian sources only reported heavy damage to the

merchant ship A merchant ship, merchant vessel, trading vessel, or merchantman is a watercraft that transports cargo or carries passengers for hire. This is in contrast to pleasure craft, which are used for personal recreation, and naval ships, which are ...

s ''Salpi'' and ''Garibaldi'' and the sinking of the old civilian training ship ''Garaventa''. The historian Ermingo Bagnasco also reports the loss of 14 lighters and the motorsailer ''Antonietta Madre''. According to the official files of the

Italian Navy The Italian Navy (; abbreviated as MM) is one of the four branches of Italian Armed Forces and was formed in 1946 from what remained of the ''Regia Marina'' (Royal Navy) after World War II. , the Italian Navy had a strength of 30,923 active per ...

(''Marina Militare''), the ''Antonietta Madre'' was sunk during the Allied

aerial bombing An airstrike, air strike, or air raid is an offensive operation carried out by aircraft. Air strikes are delivered from aircraft such as blimps, balloons, fighter aircraft, attack aircraft, bombers, attack helicopters, and drones. The official d ...

of Genoa on 23 October 1942. A

salvo A salvo is the simultaneous discharge of artillery or firearms including the firing of guns either to hit a target or to perform a salute. As a tactic in warfare, the intent is to cripple an enemy in many blows at once and prevent them from f ...

from ''Malaya'' landed between short of the Italian battleship , undergoing repairs in dry dock north of ''Molo Giano'' (Giano

Pier A pier is a raised structure that rises above a body of water and usually juts out from its shore, typically supported by piling, piles or column, pillars, and provides above-water access to offshore areas. Frequent pier uses include fishing, b ...

); no damage was reported on ''Duilio''. A targeting error by a gunnery officer on board ''Malaya'' some offshore caused an

armour-piercing Armour-piercing ammunition (AP) is a type of projectile designed to penetrate armour protection, most often including naval armour, body armour, and vehicle armour. The first, major application of armour-piercing projectiles was to defeat the t ...

round to hit Genoa Cathedral; the

shell Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses Science Biology * Seashell, a hard outer layer of a marine ani ...

failed to explode and remains on display there. There were 144 civilian dead and 272 wounded at Genoa as result of the shelling. ''Ark Royal''s aircraft attacked

Livorno Livorno () is a port city on the Ligurian Sea on the western coast of the Tuscany region of Italy. It is the capital of the Province of Livorno, having a population of 152,916 residents as of 2025. It is traditionally known in English as Leghorn ...

and mined

. An attempt by the Italian fleet to intercept the British force failed, and all ships returned to Gibraltar on 11 February 1941.

References

{{DEFAULTSORT:Grog Allied naval victories in the battle of the Mediterranean Naval battles and operations of World War II involving the United Kingdom Naval aviation operations and battles February 1941 in Europe