Fort Douaumont

Cold air reaches you first. It drifts out of the dark entrance and carries the smell of wet concrete, rust and old earth. Water drips somewhere deep inside, slow and steady. Above you, grass and moss cover a long, low mound that hardly looks like a building at all. That mound is Fort Douaumont, and in 1916 it stood at the centre of one of the longest battles in human history.

The fort sits on high ground north of Verdun, in north-eastern France. Its builders chose this ridge with care. From here, observers could watch the approaches to the city for kilometres in every direction. Construction began in the 1880s, as part of a ring of forts that France built after its defeat in the war of 1870. The engineer behind that national system was General Raymond Adolphe Séré de Rivières. His forts were meant to make the eastern frontier impossible to break.

At first, Douaumont was built of masonry. Then a new kind of artillery shell appeared, packed with high explosive, and old stone walls suddenly looked fragile. So the French army rebuilt the fort's protection. Engineers added a thick layer of concrete over the roof. Beneath it, they placed a cushion of sand to absorb the shock of impacts. Steel gun turrets were set into the top, designed to rise, fire, and then sink back down out of sight.

Here is the first surprise. By early 1916, this enormous fortress was almost empty. French commanders had watched the great Belgian forts at Liège and Namur fall quickly to German heavy guns in 1914. They concluded that forts were outdated. Many of Verdun's guns were removed and sent elsewhere along the front. Douaumont kept only a small garrison of older reserve soldiers, and much of its strength had quietly gone.

The German offensive at Verdun opened on 21 February 1916. Four days later, on 25 February, a small group of German soldiers approached the fort through the confusion and snow. They found a way inside. There was almost no fighting. The largest fort in the Verdun ring changed hands with barely a shot fired. In Germany, newspapers celebrated the capture as a great victory. In France, the loss came as a deep shock.

For the next eight months, the fort stood in German hands, close to the front line. It became a shelter, a supply point and a field hospital. Thousands of men passed through these corridors. Outside, the ground was shelled so heavily that the forests disappeared and the soil turned into a field of overlapping craters. You can still see that ground today. Look at how the earth around the fort rises and falls in uneven waves.

The second surprise is the darkest part of the story. On 8 May 1916, a fire and a series of explosions broke out inside the fort, among stored ammunition and fuel. Hundreds of German soldiers were killed in the blast and the panic that followed. It was impossible to remove so many bodies during the fighting. The dead were placed in a section of the fort, and that space was sealed with a wall. It remains a German war grave today.

When you walk the corridors, you may pass that memorial. Please treat it as what it is — a cemetery. Visitors often lower their voices here without being asked. The air is heavy and still. The light from the electric lamps falls on rough walls that show water stains, old paint and the marks of daily life from more than a century ago.

The French were determined to take the fort back. In October 1916, they prepared a large counter-attack. Heavy railway guns, firing shells of 400 millimetres, struck the fort and broke through parts of the concrete. On 24 October 1916, French infantry, including a celebrated colonial regiment from Morocco, advanced through fog and recaptured Douaumont. The Battle of Verdun continued until the middle of December. By then, hundreds of thousands of French and German soldiers had died.

Today, the walk inside takes you through long, narrow galleries. The concrete ceilings are low in places, and small mineral formations hang from them like thin icicles. They formed as rainwater seeped slowly through the concrete over many decades. You will see barracks rooms, washrooms, ammunition stores and the passages that led up to the turrets. The temperature stays cool all year, so even a summer visit can feel like stepping into autumn.

When you climb onto the roof, the scale of the place becomes clear. The surface is uneven, marked by shell holes softened by grass. Steel turrets still rise out of the ground, grey and scarred. One large turret could lift its gun above the roof and lower it again. Stand near it, and you can understand why soldiers once believed these forts could not be taken.

From the roof, look across the landscape. The forest you see was mostly planted after the war, on ground too damaged and too dangerous to farm again. Nearby stands the Douaumont Ossuary, a long building with a tall tower, which holds the bones of unidentified soldiers from both armies. Close by, the old village of Douaumont was destroyed during the battle and never rebuilt. It still exists on paper, as one of the villages that, in the French phrase, died for France.

Before you leave, pause for a moment on the grass above the corridors. Listen to the wind moving through the trees, and to the birds that have returned to this ridge. Under your feet are the rooms you just walked through, cold and dripping in the dark. As you walk back down, notice the small dips and hollows along the path. Each one is a crater, and each one is part of the story you have just heard.