The French plan of 1926 to create a Light Infantry Support Tank led to the development of the existing Renault NC1 prototype into the Char D1. The type was produced between 1931 and 1935 in a number of 160. There was a pre-series of ten vehicles; later 150 standard vehicles were built. Until 1936 the vehicles were fitted with FT-17 turrets because the intended cast ST2 turrets were not ready yet. The ST2 turret was armed with a short 47mm SA34 tank gun with a coaxial 7.5mm MG. The hull carried a 7.5mm MG in the bow. The type did not serve as an infantry support tank as originally intended, but as France’s major battle tank of the early thirties; it was quickly phased out in 1937 because of its mechanical unreliability.