Palmerston Fort - Horse Sand Sea Fort

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Horse Sand Fort, is one of the larger Royal Commission sea forts in the Solent off Portsmouth. It is 240' across, built between 1865 and 1880, with 2 floors and a basement, armour plated all round. The original armament was to have been 45 10" and 44 12.5" RML guns on the gun floors and 10 12" RMLs on the roof in 5 turrets. In fact the turrets were never built, and the limited space meant the 12.5" guns had to be operated with less than full charges of powder. Until in 1882 12" RBL guns were placed in alternate bays.

Other sea forts include Spitbank Fort, St Helens Fort (lo res) and No Mans Land Fort.