The Byviks fort (8:th Battery) was armed with four modern 12 cm guns m/1897 and three 57mm guns m/1899 in in armoured turrets. The fort was the state of the are of fortifications for its time with dry moats that could be covered by flanking fire from the caponier guns.

8e Batteriet VaxholmslinjenVarVaxholmVaxholmslinjen