Copenhagen had a
coastal defence in three lines
The second and mid line consisted of
battery "Charlottenlund Battery" (later mentioned as a naval fort)
fort "Middelgrunds Fort"
battery "Kastrup Battery"
(later mentioned as a naval fort)
The ground defence line also got two naval defence "wings"
battery "Hvidoere Battery" in the north
battery "Avedoere Battery" in the south.