Copenhagen had a coastal defence in three lines
The second and middle line consisted of :
The coastal battery “Charlottenlund Battery” (later referred to as a fort)
The naval fort “Middelgrunds Fort”
The coastal battery “Kastrup Battery” (later referred to as a fort)
The defence line also got two coastal batteries in the left and right wings.
The coastal battery “Hvidöre Battery” in the north
The coastal battery “Avedöre Battery” in the south.