The fortress was built from 1885 to 1886 and consisted of three fixed batteries; Central Battery (batt. I), Northern Battery (batt. II) and Southern Battery (batt. III).
Fästningen byggdes 1885–1886 och bestod av tre fasta batterier; Mellersta batteriet (batt. I), Norra batteriet (batt. II) och Södra batteriet (batt. III).