Fire at will!
In the exhibition of the fort, a model has been made of the twin guns from the main tower of the fort. You are welcome to point and fire the twin guns. The guns are in the upper floor, and in the lower floor you turn the guns into the relevant direction.
The real twin gun tower
When the real twin guns were procured, it was of the best artillery of that time, and bought in Germany. The guns were classified as 15 centimetre, i.e. the diameter of the barrel is 15 centimetres. The upper floor of the heavy armoured tower houses the twin guns, and the lower floor the capstan for turning the tower and detailed information about targets, etc.
Range 6 kilometres
The 15 cm guns were used in armoured towers in the forts and as movable artillery in the batteries of the Western fortification line. The turret of Garderhøjfort could fire directly in the directions West, East and South. To the North the fire was indirectly because of the construction of the fort. Artillery observers were used all over in the fortification system to guide the direction of fire.
The 15 cm gun had an efficient range of fire of 7,500 meters if it was mounted in an open gun carriage. In the tower of Garderhøjfort the distance was only 5,700 meters due to limited possibilities for elevation of the barrels. The rate of fire for the two guns in the tower of Garderhøjfortet was in total two grenades pr minute.
Crew of 18 men
The crew to man the twin guns was of 18 men, and drills were frequent in all details. Mistakes were not on the agenda. The soldiers in the two floors of the tower worked together to provide the ammunition, which was taken up by a lift from and the ammunition magazines down in the fort. They probably used a speaking tube in their communication.
Was never fired in anger
Denmark managed to stay neutral in the First World War and was not attacked, so the fort never fired a shot in anger. However, test shooting took place. At a test shooting in 1917, the projectiles fired contained no explosives, and the guns aimed at a floating target in Lyngby Sø (Lake). The trajectory covered a built up area, and a soldier who took part in the shooting has told, that it took quite a long time to recover all 18 dummy grenades fired.