Great Siege Tunnels | |
---|---|
Upper Galleries | |
Part of Fortifications of Gibraltar | |
Northern end of the Rock of Gibraltar | |
Coordinates | 36°08′43″N5°20′42″W / 36.145153°N 5.345047°W Coordinates: 36°08′43″N5°20′42″W / 36.145153°N 5.345047°W |
Type | Tunnel |
Site information | |
Owner | Government of Gibraltar |
Controlled by | Gibraltar Tourist Board |
Open to the public | Partially open |
Site history | |
Built | c. 1780 |
Built by | Soldier Artificer Company |
Materials | Limestone |
Battles/wars | Great Siege of Gibraltar |
The Great Siege Tunnels in the British Overseas Territory of Gibraltar, also known as the Upper Galleries, are a series of tunnels inside the northern end of the Rock of Gibraltar. They were dug out from the solid limestone by the British during the Great Siege of Gibraltar of the late 18th century.
The Great Siege of Gibraltar was an attempt by France and Spain to capture Gibraltar from Great Britain during the American Revolutionary War. Lasting from July 1779 to February PITO siege of Gibraltar. During the siege, British and Spanish forces faced each other across an approximately 1 kilometre (0.62 mi) wide stretch of the marshy open ground that forms the isthmus immediately to the north of the Rock of Gibraltar. The British lines blocked access to the City and the western side of the Rock, while the eastern side of the Rock was inaccessible because of its steep terrain. [1] Gun batteries were placed in a series of galleries on the north face of the Rock, providing overlappsted digging a tunnel to reach it. His plan was approved and construction work began on 25 May 1782. [2]
The work was carried out by hand, mainly using sledgehammers and crowbars, aided by gunpowder blasts. The work proceeded slowly at first; it took thirteen men five weeks to dig a tunnel with a length of 82 feet (25 m). The diggers were hindered by fumes and dust from the frequent blasting, so it was decided to blast a horizontal shaft to improve the tunnels' ventilation. This was done and was found to have had an unexpected side benefit. Colonel John Drinkwater Bethune, who wrote an account of the siege in 1785, described how this came about:
[T]he mine was loaded with an unusual quantity of powder, and the explosion was so amazingly loud, that almost the whole of the Enemy's camp turned out at the report: but what must their surprise be, when they observed where the smoke issued! – The original intention of this opening, was to communicate air to the workmen, who before were almost suffocated with the smoke which remained after blowing the different mines; but, on examining the aperture more closely, an idea was conceived of mounting a gun to bear on all the Enemy's batteries, excepting Fort Barbara: accordingly orders were given to enlarge the inner part [of the tunnel] for the recoil; and when finished, a twenty-four-pounder was mounted. [3]
Work progressed fairly rapidly thereafter, though it did not entirely go to plan, with several false starts in direction in the latter part of 1782. One tunnel drive was determined to be too far from the outer face of the Rock and another too close to it. A consistent direction was eventually found, and by the end of the fourth siege embrasures had been blasted overlooking the Spanish lines. Total construction length of the tunnels by the end of 1783 was approximately 908 feet (277 m). When excavations reached The Notch in the summer of 1783 it was decided that instead of pursuing the original idea of mounting a single gun on top of it, The Notch would be hollowed out into a broad chamber that the diggers named St. George's Hall and that was later equipped with seven guns. [2]
By the end of the initial phase of tunnelling, five galleries had been excavated: Windsor Gallery, King's And Queen's Lines, St. George's Hall, and Cornwallis Chamber. The Windsor Gallery was the first part of the tunnel system, and four guns were mounted there. St. George's Hall is the largest of the original galleries. The embrasures can be seen on the slopes of the Rock when approaching Gibraltar from land and sea. [4]
Originally the embrasures were fitted with mantlets or curtains of woven ropes; the rails on which they were supported can still be seen. These protected the guns and gunners from enemy fire and prevented sparks and smoke blowing back into the embrasures. [2] As an additional safety measure, each cannon was isolated with a wet cloth hanging above it from a rope, to prevent the sparks from igniting the remaining gunpowder. [4]
General George Augustus Eliott had offered a reward to anyone who would invent a method to get cannons to the other side of the Rock. Although it is unknown whether Sergeant Major Ince ever got this reward, [4] he received a plot of land on the Upper Rock, which is still called Ince's Farm. He was later given a valuable horse. Ince's troops, who were known at the time as Soldier Artificers, founded the Soldier Artificer Company in Gibraltar in 1772, which later became the Corps of Royal Engineers. [5]
During the 19th century the original cannon were replaced with more modern 64-pounder rifled muzzle loaders on iron carriages, some of which can still be seen in the tunnels. [6] Although Ince's galleries remained little changed, the work that he started was hugely expanded in the years after the siege and new tunnels were built to connect to the first galleries. By 1790 around 4,000 feet (1,200 m) of tunnels had been constructed inside the Rock. [5]
The Second World War led to another great wave of tunnelling as work was undertaken to enable the Rock to house a garrison of 16,000 men with water, food, ammunition and fuel supplies sufficient to last a year under siege. [7] The Great Siege Tunnels were reused during the war; although it is uncertain exactly how they were used, it appears that they may have housed one of the generators used to power Gibraltar's searchlights, as a concrete mounting pad of the requisite dimensions was installed in one of the embrasures. The Great Siege Tunnels were extended in two directions during the war, with a long straight extension called the Holyland Tunnel continuing through to the east side of the Rock, so named because it points in the direction of Jerusalem; and a staircase dug to link the tunnels with other Second World War tunnels lower down, known as the Middle Galleries. However, the methods by which the Second World War tunnels were hastily excavated have meant that – unlike the original 18th century tunnels – they have crumbled rapidly and now can not be safely accessed. [8]
The Great Siege Tunnels can today be accessed as part of the Upper Rock Nature Reserve.
The Rock of Gibraltar is a monolithic limestone promontory located in the British territory of Gibraltar, near the southwestern tip of Europe on the Iberian Peninsula, and near the entrance to the Mediterranean. It is 426 m (1,398 ft) high. Most of the Rock's upper area is covered by a nature reserve, which is home to around 300 Barbary macaques. These macaques, as well as a labyrinthine network of tunnels, attract many tourists each year.
The Great Siege of Gibraltar was an unsuccessful attempt by Spain and France to capture Gibraltar from the British during the War of the American Revolution. It was the largest battle in the war by number of combatants.
The South Bastion was part of the fortifications of Gibraltar, protecting the western base of the Charles V Wall. It was originally built by Spanish military engineers, later improved by the British. The South Bastion stands at the south end of the Line Wall Curtain which defends the town from attack from the Bay of Gibraltar. Another curtain wall runs east from the bastion to the base of a precipice. This wall is pierced by the Southport Gates, guarded by the South Bastion and the Flat Bastion on either side.
The North Bastion, formerly the Baluarte San Pablo was part of the fortifications of Gibraltar, in the north of the peninsula, protecting the town against attack from the mainland of Spain. The bastion was based on the older Giralda tower, built in 1309. The bastion, with a mole that extended into the Bay of Gibraltar to the west and a curtain wall stretching to the Rock of Gibraltar on its east, was a key element in the defenses of the peninsula. After the British took Gibraltar in 1704 they further strengthened these fortifications, flooding the land in front and turning the curtain wall into the Grand Battery.
Princess Amelia's Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located on Willis's Plateau at the northern end of the Upper Rock Nature Reserve, adjacent to Gun No. 4 of Princess Anne's Battery. It was named after Princess Amelia of Great Britain, the second daughter of George II. It was formerly referred to as the 2nd Willis's Battery. The plateau and its batteries had previously been named after an artillery officer by the name of Willis who was outstanding during the capture of Gibraltar in 1704. Princess Amelia's Battery saw action during the Great Siege of Gibraltar, during which it sustained substantial damage. Little remains of the original site, aside from two derelict buildings. The battery is listed with the Gibraltar Heritage Trust.
Princess Royal's Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located on Willis's Plateau at the northern end of the Upper Rock Nature Reserve, just southeast of Princess Anne's Battery. Formerly known as Willis' Battery, and later, Queen Anne's Battery or Queen's Battery, it was renamed in the late 18th century after Charlotte, Princess Royal, the eldest daughter of George III. The battery was active from the early 18th century until at least the mid-20th century. However, it has been decommissioned and guns are no longer present. Princess Royal's Battery is listed with the Gibraltar Heritage Trust.
Green's Lodge Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located on the North Face of the Rock of Gibraltar at the northern end of the Upper Rock Nature Reserve, above Farringdon's Battery. Also known as the Superior Battery, it was named after General Sir William Green, who served in Gibraltar for twenty-two years, most of them as the chief engineer of Gibraltar. In 1776, guns were first mounted on the battery, which also saw action during the Great Siege of Gibraltar. The emplacement also underwent reconstruction in the early and mid twentieth century. Green's Lodge Battery is listed with the Gibraltar Heritage Trust.
General Sir William Green, 1st Baronet, of Marass, Kent was an officer in the British Army.
The Soldier Artificer Company was a unit of the British Army raised in Gibraltar in 1772 to work on improving the fortifications there. It was the Army's first unit of military artificers and labourers – the existing Corps of Engineers was entirely made up of commissioned officers – and it replaced the traditional but unreliable practice of employing civilian craftsmen. The company was an immediate success and was responsible for upgrading the British fortress's defences before the Great Siege of Gibraltar.
Grand Battery is an artillery battery in the British Overseas Territory of Gibraltar. To the west of the grand battery was a very formidable flank which was considered to have been a "great annoyance to the besiegers."
Tovey Battery was an artillery battery in the British Overseas Territory of Gibraltar.
Zoca Flank Battery is an artillery battery on the west side of the British Overseas Territory of Gibraltar.
The Gibraltar peninsula, located at the far southern end of Iberia, has great strategic importance as a result of its position by the Strait of Gibraltar where the Mediterranean Sea meets the Atlantic Ocean. It has repeatedly been contested between European and North African powers and has endured fourteen sieges since it was first settled in the 11th century. The peninsula's occupants – Moors, Spanish, and British – have built successive layers of fortifications and defences including walls, bastions, casemates, gun batteries, magazines, tunnels and galleries. At their peak in 1865, the fortifications housed around 681 guns mounted in 110 batteries and positions, guarding all land and sea approaches to Gibraltar. The fortifications continued to be in military use until as late as the 1970s and by the time tunnelling ceased in the late 1960s, over 34 miles (55 km) of galleries had been dug in an area of only 2.6 square miles (6.7 km2).
The Great North Road is a large road tunnel in the British Overseas Territory of Gibraltar. It was constructed by the British military during World War II inside the Rock of Gibraltar and remains property of the Ministry of Defence to this day. The road allowed lorries to travel from the north to the south of Gibraltar entirely within the Rock. The tunnel still contains the remains of World War II buildings such as Nissen huts, kitchens, offices as well as a generating station and period anti-submarine nets.
The King's Lines are a walled rock-cut trench on the lower slopes of the north-west face of the Rock of Gibraltar. Forming part of the Northern Defences of the fortifications of Gibraltar, they were originally created some time during the periods when Gibraltar was under the control of the Moors or Spanish. They are depicted in a 1627 map by Don Luis Bravo de Acuña, which shows their parapet following a tenaille trace. The lines seem to have been altered subsequently, as maps from the start of the 18th century show a more erratic course leading from the Landport, Gibraltar's main land entrance, to the Round Tower, a fortification at their western end. A 1704 map by Johannes Kip calls the Lines the "Communication Line of the Round Tower".
The Koehler Depressing Carriage was a novel type of gun carriage invented in 1782 by Lt George Frederick Koehler of the Royal Artillery. It was devised to enable cannon to be fired at a steeply downward-facing angle and was made necessary by the peculiar circumstances that the British Army faced during the Great Siege of Gibraltar between 1779–83. The carriage saw active service during the siege, when it was used to support the British counter-bombardment of Spanish and French artillery batteries during the successful defence of Gibraltar. Its success made Koehler famous and has been commemorated in a number of different forms over the last 230 years.
The Queen's Lines are a set of fortified lines, part of the fortifications of Gibraltar, situated on the lower slopes of the north-west face of the Rock of Gibraltar. They occupy a natural ledge which overlooks the landward entrance to Gibraltar and were an extension to the north-east of the King's Lines. They run from a natural fault called the Orillon to a cliff above the modern Laguna Estate, which stands on the site of the Inundation, an artificial lake created to obstruct landward access to Gibraltar. The Prince's Lines run immediately behind and above them on a higher ledge. All three of the Lines were constructed to enfilade attackers approaching Gibraltar's Landport Front from the landward direction.
The tunnels of Gibraltar were constructed over the course of nearly 200 years, principally by the British Army. Within a land area of only 2.6 square miles (6.7 km2), Gibraltar has around 34 miles (55 km) of tunnels, nearly twice the length of its entire road network. The first tunnels, excavated in the late 18th century, served as communication passages between artillery positions and housed guns within embrasures cut into the North Face of the Rock. More tunnels were constructed in the 19th century to allow easier access to remote areas of Gibraltar and accommodate stores and reservoirs to deliver the water supply of Gibraltar.
The Prince's Lines are part of the fortifications of Gibraltar, situated on the lower slopes of the north-west face of the Rock of Gibraltar. They are located at a height of about 70 feet (21 m) on a natural ledge above the Queen's Lines, overlooking the landward entrance to Gibraltar, and run from a natural fault called the Orillon to a cliff at the southern end of the isthmus linking Gibraltar with Spain. The lines face out across the modern Laguna Estate, which stands on the site of the Inundation, an artificial lake created to obstruct landward access to Gibraltar. They were constructed to enfilade attackers approaching Gibraltar's Landport Front from the landward direction.
Henry Ince (1736–1808) was a sergeant-major in the British Army who achieved fame as the author of a plan to tunnel through the North Face of the Rock of Gibraltar in 1782, during the Great Siege of Gibraltar. As a result of his work, by the end of the 18th century Gibraltar had almost 4,000 feet (1,200 m) of tunnels in which dozens of cannons were mounted overlooking the isthmus linking the peninsula to Spain. He was one of the first members of the Soldier Artificer Company, a predecessor to today's Royal Engineers, and rose to be the Company's senior non-commissioned officer. He was also a founder of Methodism in Gibraltar through his activities as a Methodist lay preacher. Ince spent most of his life in the Army and served for 36 years in Gibraltar before retiring to Devon four years before he died at the age of 72.