The Garrison school, which is located to the north west of the Church of St. Mary, was constructed in 1858 as part of a generous scheme of expansion and modernisation undertaken within the castle during and after the Crimean War (1853-1856). This building forms part of the mid-19th cent move to improve the education of soldiers and their children. It consists of a single storey stone-built schoolroom of ragstone with ashlar openings, now the Church Hall, with the two-storeyed school-master’s house attached at its western end. (location accurate to the nearest 1m based on available information)