Fort de Chaudfontaine: A Belgian Fortress Defending the Liège Valley
Site at a Glance
- Rating
- 4
- Popularity
- Very Low
- Country
- Belgium
- Primary era
- Modern
- Eras represented
- Modern
- Civilizations
- Belgian, German
- Site type
- Military
- Remains
- Fort
On this page12 sections
History
Fort de Chaudfontaine is a Belgian fortress built between 1881 and 1884 as part of the late-nineteenth-century Fortified Position of Liège. Designed by General Henri Alexis Brialmont, a Belgian military engineer, it formed one of twelve forts intended to defend Liège and the Vesdre valley. The fortified position belonged to Belgium’s National Redoubt, a strategic system designed to protect the country’s government, army, and population if an invading force broke through the outer defenses.
Construction and Belgian Defence
Built on the heights above the Vesdre valley, Chaudfontaine was intended to prevent renewed occupation of Liège by French forces and to command the route through the valley. Belgian troops occupied it shortly after completion. Although it was one of the smaller forts in the defensive belt, its position south of Fort Fléron and near Fort Embourg gave it a place within the wider protection of Liège.
The First World War
German forces attacked Liège from 6 August 1914, and heavy bombardment of Chaudfontaine began on 12 August. Between 200 and 300 shells struck the fort each hour. On 13 August, a shell hit the turret housing the 21 centimetre howitzer, causing an explosion and fire. Toxic fumes spread through the fort and killed at least 58 members of the garrison. The interior became unbreathable, and after two days of resistance the defenders surrendered that day.
German forces occupied Chaudfontaine for the rest of the war. During 1914 and 1915 they installed ventilation equipment and replaced the electrical system, which had been badly damaged during the bombardment. Belgium recovered the fort after the war.
Interwar Modernization
During the 1930s, the Belgian army restored, strengthened, and rearmed Chaudfontaine as part of the Fortified Position of Liège II, the interwar modernization of the Liège defensive system. Existing spaces were divided by additional reinforced-concrete rooms. Ventilation, sanitary facilities, communications, and electrical power were modernized, while new barracks provided peacetime accommodation. A large infantry shelter was also built on the glacis, the gently sloping open ground outside a fort, for connection with the main position.
The Second World War
After Germany invaded Poland, Chaudfontaine’s security measures and state of alert were increased. Following the German capture of Fort Eben-Emael, the fortress provided fire support for Belgian troops and neighboring forts. The Battle of Belgium, Germany’s invasion and campaign in Belgium in May 1940, reached Chaudfontaine on 16 May. The Luftwaffe bombarded it during the early hours of 17 May, causing explosions inside the fort. A subsequent German infantry assault produced further casualties, and the garrison surrendered at 19:30.
The Wehrmacht subsequently left Chaudfontaine unused, although useful materials were removed for use elsewhere. Outside the main gate, a small cemetery and war memorial were established for those who died in and around the fortress. They contain the remains of the 71 people killed in 1914, including two from Fort de Fléron, as well as ten people killed between the forts and a civilian executed at Romsée.
Later Use
In the 1990s, CSM asbl acquired the fort and converted it into an adventure park. The fort remains preserved and is occupied by that park, while the cemetery and memorial continue to form part of the associated commemorative complex.
Remains
Setting and Defensive Form
Chaudfontaine stands about seven kilometres southeast of central Liège, at an elevation of approximately 220 metres on the heights above the right bank of the Vesdre valley. Its irregular rectangular plan differs from the triangular layout used for most of Brialmont’s forts. A dry ditch surrounds the position, measuring about six metres deep and eight metres wide. The fort was constructed entirely from unreinforced concrete, unlike contemporary French forts that commonly used masonry. About four metres of concrete protected the top of the central massif, the main central block containing the principal artillery and protected interior spaces. The less exposed walls of the barracks were about 1.5 metres thick.
Barracks and Service Areas
The barracks opened toward the rear ditch, facing Liège. The service area stood directly opposite and received less protection than the more strongly defended sides. Latrines, showers, the kitchen, and a morgue occupied the counterscarp, the outer side of the defensive ditch. Their position made these facilities particularly vulnerable during combat. Later modernization subdivided the interior with smaller reinforced-concrete compartments beneath galvanized corrugated-metal ceilings. The cavities above those ceilings were filled with excavated material.
Artillery and Ditch Defence
The central massif carried the main armament. A Grusonwerke turret held a single 21 centimetre Krupp howitzer, while a Schneider-Creusot turret carried two 15 centimetre guns and a Châtillon-Commentry turret carried two 12 centimetre Krupp guns. Four Grusonwerke turrets mounted 57 millimetre guns for local defence, and an observation turret carried a searchlight. Nine rapid-fire 57 millimetre guns in counterscarp casemates, fortified chambers for weapons or personnel, defended the ditches and rear entrance with enfilading fire, directed along the length of a defensive line. The turret mechanisms came from several manufacturers, while the heavy guns were generally German-made, particularly by Krupp. All the gun turrets could be retracted when necessary.
Ventilation and Later Additions
The artillery used black powder rather than smokeless powder. Its gases were intended to fill the ditches and hinder attackers, but they also accumulated in the confined firing chambers and could spread through the fort. During the German occupation, two air intakes were built on the glacis and linked to the interior by an underground passage. A fan distributed air through the fort. The 1930s modernization added an air-intake tower overlooking the Vesdre and further protected the internal rooms. A large infantry shelter was built on the glacis, intended to connect with the main fort, and new peacetime barracks were constructed during the same phase.
Memorial Complex and Present Condition
The small cemetery and war memorial outside the main gate preserve the remains of those killed in 1914 and in the surrounding fighting, including the dead from Fort de Fléron, the area between the forts, and Romsée. Inside, the preserved fort is now used as an adventure park. This present use occupies the surviving military structure while retaining the fort’s physical relationship with its cemetery and memorial.
