Only the English could classify a Fort a Ship - Malta

[Ederico]

Unless adeguately explained, I'm assuming this a proof of English deficiency. A Fort is classified a Ship.

In 1912 it was officially listed as a ship by the British, and named HMS Egmont; in1933 it was renamed HMS St Angelo.

An image of the fort, or ship, in question is attached.

[Semper Fi]

The misunderstanding would arise from the lack of the term 'stone frigate'. Forts such as St Angelo are not classified as ships, regardless of the term HMS (His or Her Majesty's Ship).

His or Her Majesty's Ship

The HMS prefix is also used by shore establishments which are commissioned 'stone frigates' in the Royal Navy. Examples include HMS Excellent, which is a training school located on an island in Portsmouth Harbour, and HMS Vulcan, in Caithness in the Highland area of Scotland, which is established to test the design of nuclear power systems for use in submarines.

Stone Frigates

"Stone frigate" is a nickname for a naval establishment on land. The term has its origin in Britain's Royal Navy, which until the late 19th century housed training and other support facilities in hulks — old wooden ships of the line — moored in ports as receiving ships, depot ships, or floating barracks. The Admiralty regarded shore accommodation as expensive and liable to lead to indiscipline. These floating establishments kept their names while the actual vessels housing them changed. For example, the gunnery training school at Portsmouth occupied three ships between its foundation in 1830 and its move ashore in 1891 but all were named (or renamed) HMS Excellent.
As ships began to use increasingly complex technology in the late 19th century, these facilities grew too large to continue afloat and were moved to shore establishments while keeping their names. An early "stone frigate" was the engineering training college HMS Marlborough, moved ashore to Portsmouth in 1880. The gunnery school continued to be named HMS Excellent after its move ashore to Whale Island in 1891. By World War I there were about 25 "stone frigates" in the United Kingdom.
The practice continues in the Royal Navy and some other navies of the Commonwealth of Nations, notably the Royal Canadian Navy.

Other Royal Navy shore establishments

HMS Collingwood
HMS Dryad
HMS Excellent
HMS Raleigh
HMS Sultan
HMS Temeraire
HMS Rooke (Gibraltar)

Sources: Wikipedia

[Ederico]

Thanks for explaining, perhaps it would be appropriate to change the acronym HMS in that case. That "HMS" withstood a Turkish siege counting 40,000+ troops in 1565.