English: spare gun between O'Hara's and Lord Airey's Batteries. These are located at the highest point on the Rock of Gibraltar at a height of 426 meters (1,383 ft). The Batteries are built on the site of O'Hara's Tower and named after Governor General Charles O'Hara. O'Hara had believed that, if a watchtower was constructed on the highest point of the Rock, the Garrison would be able to observe the Spanish fleet at Cadiz. O'Hara's Tower was not successful in its intended purpose and was therefore nicknamed O'Hara's Folly.
The 9.2 inch Mark X Coastal Defence Guns at O'Hara's, Lord Airey's and Spur Batteries had a range of 29,600 yds which easily covered both the Straits of Gibraltar (25,500 yds) and the Bay of Gibraltar (9,000 yds).
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