 Work began in 1882 on Fort Glanville 's northern sister Fort Largs — then known as the Port Adelaide battery — to the same specification as Fort Glanville ; its barracks and rear defence wall were finished in 1885 . Though guns had already been purchased specially , plans for the third fort at Glenelg were not proceeded with . South Australia was experiencing a depression in 1886 and that coupled with a report by General James <unk> Edwards scuttled plans for the third coastal fort . As early as 1888 the emphasis for defence of the Adelaide coast had already shifted to Fort Largs ; a fact cited as part of the reason for abandonment of the Glenelg fortifications . 
