A length of Napoleonic-era defensive wall has been observed west of the Coastguard pub and either side of the road. During the Seven Years War and Napoleonic Wars St Margaret's Bay was defended against invasion. The Bay was used for barracks by the cavalry and infantry. The name ‘Barracks Bottom’ as well ‘Old Guard House’ and ‘Officers’ Quarters’ all appear on the first edition of the Ordnance Survey map in 1871.