The 12 cm tornautomatpjäs m/70 ("12 cm automatic turret gun model 1970"), also known as ERSTA (Ersättning Tungt Artilleri or "Replacement Heavy Artillery") was developed to defend vital points like seaports from enemy landing ships, as well as area denial and fire support, even on a nuclear battlefield. Due to political cost-cutting requirements, the number of 12/70 batteries built in Sweden was limited to six. For the same reason, some protection aspects were abandoned.