Trekroner Søfort is a fortification at the entrance to the Copenhagen harbour. It was part of Copenhagen's fortifications.
The original location of Trekroner Fort was a few hundred meters north of the current one. In 1713, three old line ships were sunk to form the basis for a battery. One of the ships was called Trekroner, and she gave her name to the fort.

Construction of the current fort began in 1787. The fortress was an important part of the Danish line of defense during the Battle of Copenhagen in 1801. It was also in action during the British attack on Copenhagen in 1807

Battle of Copenhagen (1807)

The Second Battle of Copenhagen was a British preemptive attack on Copenhagen, targeting the civilian population in order to seize the Dano-Norwegian fleet and in turn originate the term to Copenhagenize.-Background:Despite the defeat and loss of many ships in the first Battle of Copenhagen in...

. From 1818 to 1828 and in 1860, the fort was strongly enhanced; but its military significance diminished after the First World War, and in 1934 it was sold to the Copenhagen harbour services. During the German occupation of Denmark the Germans used the fortress as a barracks. After the war it fell vacant until 1984, when it was opened to the public.

External links

• http://www.fortunfortet.dk/FFsider/ffleksikon/trekroner/trekroner.htm