Orillon Gallery (1788) - This gallery leads to a fairly large chamber which, according to the 1819 report, was a second Orillon Battery. Into the walls of this emplacement, a few feet up, have been cut two wide ledges. These supported large wood planks, which formed a platform for a gun and was called third Orillon Battery. A fourth Orillon Battery existed on the roof above the third and a wooden, in the recess of the rock behind, established inter-communication between the second, third and fourth batteries. From what was the third Orillon Battery, a small gallery in the rock behind communicates with the Queen’s Gallery East, near the loop-holed wall.

In latter years the second Orillon emplacement was used as a bake-house, one of the ovens can still be seen there today.

Steps from the second Orillon lead down to a cave where three guns were mounted, forming the first Orillon Battery. At the back of the cave is a small shelter or magazine.

The name Orillon is French for little ear from Oreille=ear, it is a term used in fortification jargon. Vaughban being the great French architect of fortifications who named all the different walls, Bastion, Couvreport, Demi-bastion, Glacis, etc.

The system behind the Queen’s Lines was divided up into the Queen’s Gallery East, the Queen’s Gallery Southwest (1789), and the Queen’s Lines Gallery (1789).

In the first named there is a small natural cave running into the rock. The Queen’s Gallery South-West has six openings into the Queen’s Lines South-West. The Queen’s Lines Gallery is divided into four barracks, with a loop-holed wall and fireplaces.

Amphitheatre Gallery (1789) leads out to Lower Forbes. This gallery forms the two sides of a triangle at the apex of which is a wooden spiral staircase (now blocked at the top because of vandalism) leading up to Prince’s Lines.

Queen’s Advance Gallery (1788) runs from the extreme end of the Queen’s Lines, passing under Lower Forbes to the Queen’s Look-Out. This is an extremely dark Gallery and had a wooden spiral staircase about twenty five yards from the entrance, (Burnt by vandals). It is possible to get back to the Queen’s Lines from the Queen’s Look-Out by passing through an opening and on to a narrow footpath overlooking the Inundation.

Within Queen’s Advance Gallery is a very steep and deep shaft called Forbes Shaft. This shaft was excavated during the Second World War and exits at ground level at the Laguna Estate. Half way down there are some machinegun nests and the shaft was used to bring up ammunition and supplies from below.

Lower Forbes - After leaving the Amphitheatre Gallery and passing over an open space, two emplacements are seen which enfilade the front of Queen’s Lines. They form the Lower Forbes Battery, and at one time were used as living rooms for the troops. In the 1819 report they are shown as being capable of holding 60 men in each room, a vivid contrast with the spacious barrack accommodation provided now-a-days. Lord Forbes was a naval officer who served with distinction in the Siege of 1726-27.

During the Second World War one of the chambers was used as a search light position, which worked in unison with a naval 4 inch gun in a bunker below at the entrance to Queen’s Advance Gallery.

Upper Forbes - This Battery appeared to exist in 1773. A flight of steps from here lead up to what was later known as “The New Emplacement” and which was the original site of the Prince’s Lines Battery. From here a very fine view of the North Face of the Rock and the Upper Galleries is obtained.

Upper All’s Well is a flight of steps leading to a cave in the Rock known as “Upper All’s Well”. The name originated from the fact that a Corporal’s Guard was posted there during the day and night and had to report “Alls Well”. Above this post a number of shot marks can be seen on the rock. These can be readily understood when it is remembered that the chain of Willis’s Batteries was just above.

One was able to get into Hanover Gallery and so into the King’s Lines from the Road to the Lines at the top of Crutchett’s Ramp, and from here another way led to the tunnel called Castle Communication which led into the Moorish Castle Barracks.

King’s Lines - Part of the original defence fortifications on the same level and South of Queen’s Lines at about 60ft O.D formed by trenches, dug out solid rock or built up with masonary. King’s Lines were in existence when the British took the “Rock” in 1704, the Prince’s Lines, behind and above at about 160ft O.D were constructed between 1704 and the Great Siege of 1779-83. Above these fortifications at about 460ft O.D are a series of batteries, named after Princesses and these with the lines and the Casemates formed the main defences against the North in 1779.