It was built in accordance with improved principles of fortification developed for the Séré de Rivières system.

The Fort de Sucy was built between 1879 and 1881 on a location that had been used by the Prussians to bombard the Saint-Maur peninsula in the 1870 war.

[1] The roughly rectangular fort has an indented front with the main entrance at the centre, flanked by caponiers in a nine-metre-wide ditch.

[1] Modernization was foreseen in 1911, with additional fortifications in concrete, including three shelters and two observation turrets with machine guns.

[1] Additional armament was installed in 1935 (Four 105mm Anti Aircraft guns), but the fort saw little action during World War II.