Contrary to what the ingame description says, the SAu40 was developed as an SPG on the basis of the Somua S35 but was later converted to a tank destroyer, one prototype was built.
The SAu 40 is not the little tankette that its predecessor, the UE 57 was. Instead, it is a large, slow-moving warehouse and it may come with a steep learning curve if one is used to the playing style of the UE 57. To start with, it comes with an average 75mm short-barreled gun with decent damage for its tier but with poor accuracy and sub-par penetration. Once upgraded, it can equip an able 75 mm long-barreled gun that will take care of any foes up to its tier level, or a very powerful 105 mm howitzer able to destroy or cripple any higher tier tank that it may face, so using it before moving on to the next tier can be a rewarding experience. The SAu 40's frontal armor is not very good, even by Tier 4 standards, but the most glaring weakness is the small turret (also known as "The Tumor") on top, where it can be easily penetrated.
The Somua SAu 40 leads to the S35 CA, and the AMX 13 105 AM mle. 50
