And have a healthy respect for those StuG's. Not much experience of them in CM, but in Close Combat: Last Stand Arnhem I held the first battlegroup of XXX Corps at Valkenswaard (i.e. the most southern sector on the map) with one single StuG IIIG. Also, in WWIIOL, I did extremely well in a StuG IIIG.
So, they might not have a turret but the sloped front is a bitch to penetrate. In CM, the StuG turns very slowly, so that's your chance. Strike fast, strike hard.