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The Hornburg (originally Súthburg) was a great Gondorian fortress built on a rock, connected to the Deeping Wall. It guarded a deep valley nestled in the northeastern White Mountains. It was built by Númenóreans in the days of the glory of Gondor.
During the War of the Ring it was commanded by Gamling the Old, and defended off a large-scale attack from Isengard during the Battle of the Hornburg. It was said among the Rohirrim that "no enemy has yet taken the Hornburg", and it was considered the strongest point in Rohan, stronger than Edoras and Dunharrow.