What came before Kharkov '42?

[Ol_PanzerGut]

I've had this mission to play through various theaters of WW2 chronologically using PzC.

For Army Group Center I've started in on Smolensk '41.

For North Africa, I've been digging into Tobruk and now El Alamein (the 4.05.01 update is really nice) 
I have Tunisia but am waiting to play through the others first.

For Army Group South though... the earliest title that picks up on that is Kharkov '42 then Stalingrad '42 then Kharkov '43.

I've been scanning through the Wargameds site for an earlier title but I can't seem to find one for the southern front.

Would that be a correct assessment or am I missing something?

Thanks!