BP 13 - Sperrbatterie Süd is a World War II German defensive position located in Frederikshavn, Denmark. As part of the Atlantic Wall fortifications, this Sperrbatterie (blocking battery) was designed to control and defend the coastal approaches to Frederikshavn harbor and the surrounding area. The position formed part of the larger Stützpunkt Frederikshavn Süd defensive complex, which was strategically important for protecting the northern Jutland coastline and the vital shipping routes in the Skagerrak and Kattegat seas.
The bunker complex at BP 13 would have included various defensive structures such as artillery casemates, ammunition storage facilities, and personnel shelters. These positions were typically armed with medium-caliber coastal defense guns capable of engaging enemy naval vessels and providing fire support for defending forces. After the war, many of the bunkers in the Frederikshavn area were repurposed by the Danish military for their own defense needs, though some sections of the complex remain restricted to the public due to ongoing military use. The surviving structures serve as important historical reminders of Denmark's wartime experience and the extensive defensive network constructed by German forces along the Danish coast during their occupation of the country.