Gun in the Hull
Unlike the British, who concentrated on heavy tanks in WWI, the French started out with the medium weight category. The first French tank, the Schneider CA1, belonged to it. In general, the French managed to create the most successful medium tanks of WWI. They were also the most numerous in their class. The British Medium Mk.A Whippet that arrived later was noticeably worse than its French equivalent.
According to a popular version of events, the French then concentrated all of their efforts on the light Renault FT, which later became the most numerous and best tank of WWI. However, that is not entirely true. The Schneider company continued working on a medium tank, taking into account the drawbacks discovered in the Schneider CA1. The tank had a large protrusion in the front, which was supposed to serve as a battering ram for smashing through enemy fortifications, but ended up being a liability. The hull was also to long. Another problem was the placement of the gun on the right side, which limited the arc of fire.
In 1917, work began on a new generation Schneider CA tank.