Festungsmuseum Vitznau: A Swiss Second World War Artillery Fortress
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- Modern
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- Military
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- Fort
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History
Festungsmuseum Vitznau in Switzerland is the former Artillery Work Mühlefluh, a Swiss Army fortress built during the Second World War as part of the country’s Reduit defensive system. Construction began in December 1941 and was completed in 1943, following plans prepared by the Office for Fortification Construction for the Swiss Army’s 3rd Army Corps.
Reduit defense during the Second World War
The Reduit was Switzerland’s strategy of concentrating resistance in the Alpine interior, using fortified routes and passes to deny an advancing enemy access to central Switzerland. Mühlefluh, also known as Fortress Vitznau and designated A 2206 by the Swiss Army, was built to help control the approaches into this defensive area.
Its mission covered both roads and waterways. The fortress was intended to block routes through the Lucerne to Stans approaches at Lopper and Acheregg Bridge, the Allweg to Ennetmoos crossing, the Brünig Pass road, and the Engelberg Valley. It also controlled the narrow part of Lake Lucerne between Ober Nas and Unter Nas and protected the Buochs to Ennetbürgen airfield.
The two 10.5 cm guns had a technical range of 21 kilometres. Their fields of fire included the sectors of Horw, Kriens, Alpnach, Kerns, and Dallenwil. They could also support Fortress Fürigen at Stansstad, which was responsible for blocking the entrance to Lake Alpnach. Mühlefluh’s supporting fortifications, known as counterworks because they protected another defensive work, were Fortress Mueterschwanderberg near Ennetmoos and Fortress Wissiflue near Wolfenschiessen. The Mühlefluh guns could reach Mueterschwanderberg, while the longer-range 15 cm fortress howitzers needed to engage Wissiflue.
Military service and modernization
Fortress Artillery Company 82 was called up in May 1943 and operated at Vitznau together with the Upper and Lower Nas works. The company’s wartime strength was 337 men in 1943, falling to 146 in 1975 and 120 in 1991. Seventy men were assigned specifically to the Mühlefluh work.
The fortress remained in military service through the Cold War. A pressure-relief tunnel, which reduced blast pressure inside the fortification, was added in 1954. In 1959, the complex received an atomic filter, a protective ventilation system for contaminated air, and an antenna room for communications equipment. The fortress was decommissioned during Army Reform 95 in 1994, a Swiss military reorganization that led to the closure of various older fortifications.
Later use
In late August 1998, the municipality and corporation of Vitznau bought the fortress and its approximately 8,700 square metre parcel from the Swiss Federal Department of Defence. The complex was subsequently used as a museum and opened in 1998 as Switzerland’s first fortress hotel. The Fortress Vitznau association now oversees guided tours, restoration, and maintenance of the former artillery fortress.
The nearby Nas lake barrier formed part of the same defensive system at the Vitznau narrows. Its works began in 1941 and protected a floating obstacle designed to block Lake Lucerne between Ober Nas and Unter Nas. The installations were handed over to Fortress Guard Company 15 in 1943. Ober Nas later served as a barracks for Swiss Army motorboat detachments, whose firing exercises took place in the Vitznau basin.
Remains
Festungsmuseum Vitznau is a rock installation at 527 metres above sea level on the southern flank of Mount Rigi. The complex is organized into a combat installation, an accommodation installation, and an operations center. Its surviving defensive system includes gun positions, observation and entrance defenses, shelter caverns, and machine-gun and mortar positions linked with barbed-wire obstacles.
Mühlefluh fortress
The main fortress combines fighting positions with the spaces required to house its garrison and direct operations. The rock construction incorporates the original artillery, close-defense weapons, communications facilities, and protective works. Some of the barbed-wire obstacles remain as part of the defensive fabric.
Gun and observation positions
The combat installation contains two gun positions, an observation position, and an entrance-defense position with a hand-grenade launching channel. Its principal armament consists of two 10.5 cm Ordonnance 1939 guns on pedestal mounts, fixed raised platforms that allow a gun to turn while remaining stable. These weapons were licensed versions of the 1927 Bofors gun, and the original main guns remain in the fortress. Machine guns added for internal and external defense are also preserved.
Entrance and close defenses
Close defense was provided by mortar and machine-gun positions, together with barbed-wire obstacles. The external defenses include Entrance Bunker A 2207, equipped with a light machine gun, and six shelter caverns designated A 2208, A 2209, A 2210, A 2211, A 2212, and A 2213. A light machine gun was a portable or fixed automatic weapon intended for close defense.
Wider Vitznau defensive position
Mühlefluh formed part of a broader defensive position extending beyond the main fortress. This network included caverns, an infantry work, rock niches, and antitank barriers. Together, these positions supplemented the main artillery installation with shelter, infantry fire, and obstacles intended to restrict movement along the approaches.
Rigi and Lützelau positions
The wider position included Rigi-Unterbuchen cavern A 2200 at Weggis and Rigi-Felsentor cavern A 2201. It also contained Hinter-Lützelau Infantry Work A 2202, the two rock niches of Untere Lützelau A 2203 and A 2204, and Untere Lützelau 3 cavern A 2205.
Hinter-Lützelau Infantry Work
Hinter-Lützelau Infantry Work A 2202 held a 4.7 cm antitank gun and a light machine gun. It was later equipped with a 9 cm antitank gun and an MG 51. The work was decommissioned in 1996, two years after the Mühlefluh fortress itself left military service.
Antitank barriers
The defensive position also included the Lützelau, Aecherli, and Mühlefluh antitank barriers, designated T 1300, T 1301, and T 1302. These barriers formed part of the ground defenses associated with the artillery fortress.
Nas lake barrier
The Nas lake barrier included a lake obstacle, the Upper Nas artillery work, the Lower Nas counterwork, and additional external defenses. Ober Nas and Unter Nas each had a garrison of 60 men. The lake obstacle was intended to close the Vitznau narrows between the two Nas positions, while the associated works provided the fortified elements of the barrier.
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