The demission of Deport in 1895, joining the private industry led by a disappointment caused by the lack of recognition by the Army, was an issue quicly solved by the project continuation by the captains Sainte-Claire-Deville and Rimailho, unconditionally helped by the General Deloye, new Artillery Director.

The first tests of the initial prototype in 1893 proved the amazing performances of the design. It received the sponsorship of the Army Artillery Director and was kept secret thanks to a smart counter-intelligence program promoting the less promising projects named 75A, 75B and 75D. The '75C' quick firing project of the commandant Deport from the Puteaux arsenal soon took the lead compared to others.

Inspired by the works of the French captains Baquet and Locard, fathers of the very first gun equipped with hydropneumatic recoil recuperating systems, and by the ones of the German engineer Haussner, inventor of the barrel long recoil, the Puteaux Arsenal captain Sainte-Claire Deville de l'Atelier de Puteaux realised at the beginning of the 1890 years several promising prototypes of fieldguns of different calibers, giving way to a request by the French Headquarters of a new 75 mm modern gun.

Canon de 75 modele 1897