L’Etacquerel Fort, described as the lower battery, was built at Bouley Bay in 1835-6. It was described as an enclosed battery and guardhouse and was to replace the 18th-century works. The landward side was protected by a dry ditch, which was 21 feet deep and between 12 and 24 feet wide. It housed four 32-pounders, and the range of buildings included a magazine, a store, an officers’ guardroom, a soldiers’ guardroom and privies. The base of the seaward wall was 54 feet above the high-water mark. The name is the diminutive of ‘L’Etacq’, which is derived from the old Norse word ‘stakkr’, meaning a heap or a stack.