When in September 1939 war broke out, all tank design policies were affected. On 15 December the Inspectorate of Tanks decided that war production should be limited to existing types with the exception of three precisely circumscribed classes: the "Char d'Accompagnement", a new medium infantry tank; the "Char de Bataille", a new heavy tank; and the "Char de Fortification", a superheavy tank. A new Commission of Tank Study was created to study these three types; it first met on 28 February 1940. The commission decided that the "Char d'Accompagnement" would need a 47 mm gun in a turret and the "Char de Bataille" at least a 90 mm gun in the hull. The Char G1, being in between the two classes, thus would not be produced.