The Char d'Assault St Chamond was introduced in 1916 and was an early example of an armoured assault gun. It featured a 75mm gun and a defensive mg firing into each 90 degree arc. Armour was a respectable 11mm.
Unfortunately it had extremely limited mobility as the tracks were too small for the hull. Another limitation was that the gun had no side to side travers meaning that the whole clumsy vehicle had to be aimed at the target.
The model is 1/72 resin and I intend to use it for 1938 games.