The SNCASE Grognard was designed as a single-seat, low-level ground-attack aircraft. Although in development in the 1950s for the French Armée de l'Air, the program was cancelled in favor of the Sud-Ouest Vautour II.
An Armée de l'Air specification for a ground-attack aircraft drawn up in 1948 was intended to spur the French aviation industry to produce a jet-powered design. Sud-Est entered the competition with a development of the earlier SE.2400 attack aircraft, after testing a model in the ONERA (Chalais-Meudon) wind tunnel. The design featured an unusual 47° swept wing design along with two stacked Nene jet engines fed by a single dorsal inlet in a compact, bulbous fuselage. The cockpit was awkwardly situated at the extreme end of the nose; the whole arrangement soon acquiring the derisive nickname: "Hunchback".

The official name SE.2410 Grognard (French: Grumbler) was derived from the nickname for a soldier of Napoleon's Old Guard. Problems encountered in test flights led to a number of modifications to the tail unit and ailerons. Development continued with Sud-Est building two prototypes with a further refinement that led to the SE.2415, identified as the Grognard II, a two-seat development that included a stretched fuselage incorporating a raised cockpit with a bubble canopy and reduced 32° wing sweep back. Following initial testing, two boundary layer fences were installed on the outer wings of the SE.2415; underwing spoilers were also tested.

Although neither prototype was initially armed, the planned armament array included two DEFA 30mm cannon as well as bombs and rockets.