Fort Hubberstone, on the west side of Milford Haven, Pembrokeshire, is a Grade II* Listed Building[1] which belongs to a series of forts built as part of the inner line of defence of the Haven following the Royal Commission on the Defence of the United Kingdom.

Together with Popton Fort on the opposite shore, it provided an interlocking field of fire, and represented the last layer of defence before reaching the Royal Naval dockyard at Pembroke Dock.

The fort was often required to fire live practice rounds, and in 1894 participated in experiments to illuminate targets with searchlights so they could be engaged at night.

[2] World War II saw the fort once again in active use, when it was used as an air raid shelter and army camp for American military personnel.

[9][10] In 2019, plans were announced to convert the site into a military-based residential camp for former service men and women.