The Verteidigungsbereich had several coastal and aircraft batteries.
Iinfantry defencelines were built at the airfield, town and harbour.
The Sperrbatterie (1./M.A.A.521), the Flakbatterie Süd (4./M.Fl.A.716) and the Ugruko belonged to StpGr Frederikhavn-Nord.
The StpGr Frederikshavn-Süd had the Stp Frederikshavn-Nord (2./M.Fl.A.716) and Wn Hafen. It is now part of the Bangsbo museum.
The third StpGr was Flugplatz Frederikshavn.
(all pictures by Henk Adriaanse, 2006)