A well was first sunk at the Citadel during the Napoleonic Phase of works at the fort. It was located at the eastern end of the Parade ground close to the former site of the temporary barracks which were constructed in the same year. The original construction consisted of a large square underground chamber and likely existed in this form until the 1860’s. The Engine House and pump room was modernised and expanded as a consequence of the 1858 Barrack and Hospital Improvement Commission which noted the inadequacy of the early arrangements, and the resulting building still survives today. (location accurate to the nearest 2m based on available information)