The pentagonal fort is surrounded by a ditch, which is traversed by fire from the caponiers.
The central barracks is sunken into the earth and encircled by firing positions on the surface of the fort.
The fort's surface was originally armed with four 155mm and five 120mm guns, with one 138mm gun.
Four 220 mm mortars completed the exposed armament.
Casemates were armed with one 155mm Mougin gun and four 138mm guns, with smaller arms defending the fort's walls, and a separate battery with four 95mm guns.
 By 1914 the surface armament had been augmented with four 90mm guns and an additional three 120mm guns.
Revolving guns defended the fort.
The fort was entered via a drawbridge.

Mont Bart covers a surface area of about 3.5 hectares (8.6 acres).
The fort's stonework came from the Bavans quarry at the foot of the massif.
The pentagonal fort is surrounded by a ditch, which is traversed by fire from the caponiers. The central barracks is sunken into the earth and encircled by firing positions on the surface of the fort. The fort's surface was originally armed with four 155mm and five 120mm guns, with one 138mm gun. Four 220 mm mortars completed the exposed armament. Casemates were armed with one 155mm Mougin gun and four 138mm guns, with smaller arms defending the fort's walls, and a separate battery with four 95mm guns.  By 1914 the surface armament had been augmented with four 90mm guns and an additional three 120mm guns. Revolving guns defended the fort. The fort was entered via a drawbridge.
Mont Bart covers a surface area of about 3.5 hectares (8.6 acres). The fort's stonework came from the Bavans quarry at the foot of the massif.
Fort du Mont Bart