Great Siege Tunnels
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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 f
Great Siege Tunnels in the Rock of Gibraltar.
Guns look to the north defending The Rock from an attack by land
View of The Notch as seen from Devil's Tower Road
Concrete depiction of George Augustus Eliott, a Koehler Depressing Carriage and the crest of the Royal Engineers at the entrance to the tunnels.
Koehler Depressing Carriage
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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 downwa
Koehler's Depressing Carriage, as depicted by its inventor
Extant example displayed at the Royal Engineers Museum, Kent
The problem that the carriage was designed to overcome: firing from the Rock of Gibraltar down into the Spanish positions below (located at the photographer's viewpoint)
Reconstruction in the Great Siege Tunnels of British gunners using a cannon mounted on a Koehler depressing carriage