O'Hara's Battery is located at the highest Southern point of the Rock of Gibraltar next to it we have Lord Airey’s Battery. This battery owes its name to General Charles O'Hara, Governor of Gibraltar between 1795 and 1802. General O'Hara considered that, if he could raise a tower on this summit, south of the Rock, he could observe the movements of the enemy in the port of Cádiz, located 60 miles away (about 100 km).