Hegra Fortress: A Norwegian Mountain Border Fort
Site at a Glance
- Rating
- 4.5
- Popularity
- Low
- Country
- Norway
- Primary era
- Modern
- External website
- Open
- Eras represented
- Modern
- Civilizations
- Norwegian
- Site type
- Military
- Remains
- Fort
On this page9 sections
History
Hegra Fortress is a Norwegian mountain fortress near Stjørdal, built between 1908 and 1910 as a border fort to block a possible Swedish advance into Central Norway. Originally called Ingstadkleiva Fort, it reflected Norwegian security concerns after the 1905 dissolution of the union with Sweden and occupied a position intended to prevent an invading force from dividing the country.
Planning and construction
Earlier conflicts between Norway and Sweden had repeatedly involved military movements through the region. In February 1906, the Norwegian general staff, the army’s central planning and command staff, proposed a blocking fort in the Stjørdalen valley. Ingstadkleiva was selected as a suitable location, and senior military authorities approved the plan after inspecting the site in March.
The Norwegian Parliament authorized construction on 26 April 1906, while funding was allocated on 12 July 1907. Work on the road to the site began in May 1908. The fort was ready for use by January 1910 and became a major Norwegian military base for the Trøndelag border areas facing Sweden.
Military service and wartime use
Hegra Fortress remained in active service until 1926, when it was placed in reserve as part of defence-budget reductions after the First World War. Its deactivation led to a new use. From 1934 to 1939, the youth branch of the Norwegian Red Cross operated a summer camp there for children.
In late 1939, Finnish soldiers belonging to the independent Lapland Group were interned at the former fort after crossing into Norway while escaping fighting in the Petsamo district. They were repatriated in early 1940. During their internment, a sauna was built at the camp.
The siege of 1940
During the Norwegian Campaign, the German invasion and Allied-Norwegian military campaign in Norway in 1940, German forces attacked Hegra Fortress from 15 April to 5 May. Hans Reidar Holtermann commanded the Norwegian garrison. The first week brought two unsuccessful German infantry assaults. During the following two weeks, the fort endured heavy artillery fire, bombing by the Luftwaffe, Nazi Germany’s air force, and aggressive German patrolling.
The garrison surrendered on 5 May 1940, after the Allied campaign in southern Norway had ended. Relief appeared unlikely, and the defenders were running short of food. Snow covered large parts of the fortress, while the fort’s plans were held in German-occupied Trondheim. As a result, the defenders had not discovered several sections of the fortifications before the surrender.
Museum and later role
After the Second World War, Hegra Fortress returned to Norwegian control and became a museum devoted especially to the history of the fort and the 1940 siege. The fortress remains owned by the Norwegian Defence Force and is financed through the Norwegian Ministry of Defence. It is also used for conferences and seminars concerned with war and peace.
Remains
Hegra Fortress occupies Ingstadkleiva, a forested hill 215 metres high south of the Stjørdalselva River and about 3 kilometres from the village of Hegra in Stjørdal Municipality, Trøndelag. The ground falls toward the Stjørdalen valley to the east, north, and northwest, while the southern approach is more elevated and hilly. The fortress commands the valley in the northern and eastern directions. To the west, views are blocked by the Grøthammeren and Hammeren hills, each about 300 metres high.
Rock-cut defenses
The fortifications include approximately 300 metres of halls and tunnels blasted into the mountain, together with trenches and gun positions excavated from the rock with explosives. Rock, reinforced concrete, and brick form the principal materials. Brick was used only in secondary areas outside the line of fire, while the main defensive works were cut into the mountain or built in concrete.
Two principal underground tunnels, each about 80 metres long, run parallel to one another. A third tunnel, approximately 35 metres long, joins them at a right angle. One of the main tunnels served as crew quarters, while the other provided a direct connection to the artillery pits above ground.
Artillery positions
The artillery positions occupy pits blasted from the rock and lined with concrete. They include two 7.5-centimetre guns and four 10.5-centimetre guns mounted in half-turrets, partially enclosed armoured gun mountings that protect the weapon while leaving part of the structure exposed. Four Krupp M/1887 field guns, manufactured by the German arms company Krupp, accompanied the fixed weapons. These guns had been transferred from the dismantled Ørje Fortress in Marker Municipality, and their ranges extended from 6 to 9 kilometres.
The fixed artillery, known as positional artillery because it was installed in permanent fortifications rather than used as mobile field artillery, was arranged in an almost straight line facing east. The 10.5-centimetre guns stood 20 metres apart, while the 7.5-centimetre guns were separated by 16 metres. The 8.4-centimetre pieces, designed before recoil systems were developed to control a gun’s backward movement after firing, were described by German forces after the 1940 surrender as “Napoleonic.”
Perimeter obstacle
A barbed-wire obstacle originally encircled the entire fortress. It was between 5 and 8 metres wide and formed part of the fort’s independent defensive system, allowing the position to resist an attack without outside support.
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