The theater of operations represents a water-skerry area with small depths and winding sea paths. There were not expected appearence battleships like destroyers and etc., so m/57 guns with caliber of 75 mm caliber was accepted. But m/57 has a considerable rate of fire up to 25 rounds per minute.
There were constructed 30 battery of this type in Sweden from 1961 till 1974. Fort Femore was one of the first of the serial. It's construction in 1961 and completed in 1963 and until 1974 he protected Sweden borders, and then was turned into a training center. Fort was in use until 1994, then it was conserved and in 2002 local authorities got the fort for artillery museum.