This expansion includes the Panzer III tank (first introduced in the Days of the Fox expansion) and the StuG III assault gun (first introduced in the Normandy expansion). However, for some of the scenarios in this Stalingrad expansion. the StuG III is considered either the earlier E model with a short barrel 75-mm gun or the sIG 33b self-propelled gun with a 150-mm howitzer (see the Unit Reference sheet and Operations cards for their values and attributes).
Note that when attacking a building, the sIG 33b may use either the Concussive Firepower ability or the Stielgranate 42 ability, never both since the Stielgranate 42 ability includes the Concussive Firepower bonus. The sIG 33b Concussive Firepower is the same as the StuG III assault gun: It receives +3 range and +3 firepower when attacking a squad in a building or pillbox.