Gibraltar / United Kingdom / O’Hara’s Battery is an artillery battery in the British Territory of Gibraltar. It is located at the highest point of the Rock of Gibraltar, near the southern end of the Upper Rock Nature Reserve, in close proximity to Lord Airey’s Battery. It was constructed in 1890 . The battery and tower were both named after the Governor of Gibraltar Charles O’Hara. The first gun mounted on the battery was a 6 inch breech loading gun, which was replaced with a 9.2 inch Mark X BL gun in 1901. The battery was in use during World War II and was last fired during training exercises in 1976
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The Rock runs a length of 3 miles, from north to south and is 3/4 mile wide. Its total area is 2 1/4 square miles, though land increasedby reclamationis not reflectedin this in this measurement. The top of the Rock, 1,396ft high, is a sharp, knife-ridge extending for about a mile and a half from the north escarpment, which is virtually inaccessible.The ridge slopes gradually south for about a mile, terminating at the southern extremity, Europa Point, in perpendicular cliffs about 100ft high. The whole upper length of the eastern face is inaccessible and the steep upper half of the western slopes is uninhabited,having been designated a nature reserve.
Geologically, Gibraltar can be divided into two main parts. To the north is a plain, consisting of sand 30ft deep, atop4ft of clay and a bed of coarse sand 2 1/4 ft thick and limestone. The second part is a mass of the Rock to the south, consisting of compact Jurassic limestone, overlaid with dark shale, limestone breccias or sands.
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