Cumberland Battery was a High Angle Fire (HAF) Battery that was built between 1890 and 1894 to mount two 9-inch RML High Angle Fire Guns. The Battery was built as an outworks on the west side of Fort Cumberland.
The battery had a Mark I gun in the Number 2 pit and a Mark 2 gun in the Number 1 pit and it is assumed that this was mainly for trial purposes. The range of these 9-inch RML HAF guns was about ten thousand yards for the 360lbs shell, and they were intended to drop onto the more lightly armour decks of armoured warships.
TNA WO 78/4164