 It is also perhaps called Nandi Hills because the hills resemble a sleeping bull.Another theory holds that the hill gets its name from an ancient, 1300-year-old Dravidian-style Nandi is temple situated on this hill.Nandidurga was traditionally held impregnable, and its storming by the army of Cornwallis on 19 October 1791 was one of the most notable incidents of the first war against Tipu Sultan of Mysore.