Henley Fort was built as a mobilisation centre[1] during the 1880-90s as part of the London Defence Positions.

[citation needed] It is the most westerly fort of a 17-mile chain that would have formed a secondary line of defence between the South coast and London.

[4] Ammunition was also created on site,[citation needed] and the fort was constructed using chalk in order to prevent gunpowder from detonating in the event of the fort being bombed.

[citation needed] During the Second World War, Henley Fort was used for defence purposes by the Home Guard.

Today the fort is an educational centre run by Surrey Outdoor Learning & Development,[6] and as such hosts groups of all types wanting an outdoor learning experience.