During the Battle of Verdun the fort changed hands 16 times and was stormed multiple times, the timeline is as follows:
September 11, 1914, the 75 mm turret fires 22 shots at a German detachment in the Bois de Mabras.

February 18, 1915, the fort is bombarded for the first time by twelve 420 mm rounds which causes little damage.

End of 1915, progressive disarmament of the fort is carried out to send the guns and ammunition to the front-line.
The four 75 mm artillery pieces are removed from the casemates, leaving only the two in the turret.

In January 1916, there is now enough gunpowder in stores for the possible destruction of the fort in case of an enemy approach.

From 21 to 26 February 1916, the fort is bombarded with shells of all sizes including 129 heavy shells.
Pillboxes and armoured observatories are damaged and the gallery leading to the 75 mm turret was cut.

Late February – early March 1915, the fort is frequently bombarded and the 75 mm turret is destroyed accidentally by heavy shells that cause the demolition explosives within to detonate.

May 14, 1916, Commandant Raynal takes command of the fort, which has no artillery.

June 1, 1916, the Germans begin preparation for the invasion of the fort through the Bois de la Caillett.
They cannot be stopped due to the fort having no artillery.

2 and 3 June 1916, German troops led by Kurt Rackow attack the fort directly with flame throwers and force French troops outside to retreat into the fort.
The Germans begin to enter the fort through the coffers of the contre-escarpe.

June 5, 1916, Commandant Raynal requests the French army to bomb the fort, where the top is taken over by the Germans, to allow a part of the garrison to evacuate the fort.

June 7, 1916, for three days water supplies are empty and the fighting takes place inside the galleries with grenades, guns and bayonets.
Commander Raynal is captured by the Germans under military honours for having fought bravely in extreme conditions with a thirsty garrison.

From 8 June to 1 November 1916, the fort is used by the Germans as a shelter and command post for the area.
The French attempt to retake the fort several times with enormous loss of life.
They bombard the fort to destroy it with heavy shells, including 400 mm rounds but the concrete walls resist.
Life inside the structure becomes impossible and the Germans eventually abandon the fort at the end of October.

2 November 1916, the fort is recaptured without resistance by a French patrol which finds it empty.

By the end of the battle, in December 1916, the fort is almost in the same condition as it was in June, except for some damage caused by French artillery.

1916–1918, the Casemates de Bourges are rehabilitated before being rearmed and an observatory along with an armoured command bunker are equipped with machine-guns.
Further defences including machine-guns are fitted in place of the 75 mm turret, to defend the area between the ravine and the village of Dieppe.
Exits and entrances of the fort are equipped with masonry baffles, armed with machine guns and grenade launcher chutes.
A network of tunnels 17 m (19 yd) long is dug beneath the fort and generators are used for lighting and ventilation of the premises.
During the Battle of Verdun the fort changed hands 16 times and was stormed multiple times, the timeline is as follows:
September 11, 1914, the 75 mm turret fires 22 shots at a German detachment in the Bois de Mabras.
February 18, 1915, the fort is bombarded for the first time by twelve 420 mm rounds which causes little damage.
End of 1915, progressive disarmament of the fort is carried out to send the guns and ammunition to the front-line. The four 75 mm artillery pieces are removed from the casemates, leaving only the two in the turret.
In January 1916, there is now enough gunpowder in stores for the possible destruction of the fort in case of an enemy approach.
From 21 to 26 February 1916, the fort is bombarded with shells of all sizes including 129 heavy shells. Pillboxes and armoured observatories are damaged and the gallery leading to the 75 mm turret was cut.
Late February – early March 1915, the fort is frequently bombarded and the 75 mm turret is destroyed accidentally by heavy shells that cause the demolition explosives within to detonate.
May 14, 1916, Commandant Raynal takes command of the fort, which has no artillery.
June 1, 1916, the Germans begin preparation for the invasion of the fort through the Bois de la Caillett. They cannot be stopped due to the fort having no artillery.
2 and 3 June 1916, German troops led by Kurt Rackow attack the fort directly with flame throwers and force French troops outside to retreat into the fort. The Germans begin to enter the fort through the coffers of the contre-escarpe.
June 5, 1916, Commandant Raynal requests the French army to bomb the fort, where the top is taken over by the Germans, to allow a part of the garrison to evacuate the fort.
June 7, 1916, for three days water supplies are empty and the fighting takes place inside the galleries with grenades, guns and bayonets. Commander Raynal is captured by the Germans under military honours for having fought bravely in extreme conditions with a thirsty garrison.
From 8 June to 1 November 1916, the fort is used by the Germans as a shelter and command post for the area. The French attempt to retake the fort several times with enormous loss of life. They bombard the fort to destroy it with heavy shells, including 400 mm rounds but the concrete walls resist. Life inside the structure becomes impossible and the Germans eventually abandon the fort at the end of October.
2 November 1916, the fort is recaptured without resistance by a French patrol which finds it empty.
By the end of the battle, in December 1916, the fort is almost in the same condition as it was in June, except for some damage caused by French artillery.
1916–1918, the Casemates de Bourges are rehabilitated before being rearmed and an observatory along with an armoured command bunker are equipped with machine-guns. Further defences including machine-guns are fitted in place of the 75 mm turret, to defend the area between the ravine and the village of Dieppe. Exits and entrances of the fort are equipped with masonry baffles, armed with machine guns and grenade launcher chutes. A network of tunnels 17 m (19 yd) long is dug beneath the fort and generators are used for lighting and ventilation of the premises.
Fort Vaux