The SU-10/KV-2 was, by all accounts, a lousy tank. However, that is mainly because it was used as a tank, and not as what it really was: an assault howitzer. As self-propelled artillery, it had potential. The Red Army never developed the KV-2 any further, but the SRA did develop the Rhunnish SU-10. By replacing the 600-hp engine with a 1400-hp engine and giving the vehicle an updated transmission, the SU-12 was born. This new-and-improved vehicle became the powerhouse of Rhunnish battlefield artillery, and one of the few self-propelled guns able to cross the Aleksandrian frontier. However, Aleksandrian fortifications proved difficult for even the SU-12-150, so a second variant was developed with a 180-mm howitzer as a supplement to Rhunnish artillery divisions.