It was built out of the ruins of the Fort de la Traversette, constructed in 1630 by Savoy.
In 1792, during the French Revolutionary Wars, the Savoyards garrisoned the old fort with fifty men.
The fort became permanently French with the exchange of territory that accompanied the Treaty of Turin in 1860.
Garrisoned with seventy men plus machine guns commanded by Sous-lieutenant Henry Desserteaux, it withstood the Italian besiegers for four days before the Franco-Italian armistice.
A garrison of forty-six soldiers defended it against French attacks during the second Battle of the Alps.