Poland 39 rules

[RedDevil]

Check the scheduled reinforcements dialog for Polish units arriving in the area. My guess would be there might be multiple arrivals over several turns which would make placing an expiration turn impracticable.
Dog Soldier

Very ingenious way to keep Polish players defending the forward positions; as I believe they did historically. 

It sure makes for a difficult game for the Polish player. While I understand the "desire" for historical situations to be represented, it takes away the game fun of a simulation. I'm playing 2 Polish Campaigns in PBEMs against 2 different Opps,1 as Polish in a normal campaign,1 as German with Polish early activation. 
My German Opp is going to find more Polish warriors than he'll ever want to see soon as he figures out where I have channeled his forces to go... I left the front lines to the border and partisan troops. All the others are back building stuff where the positions matter. Hopefully I can whittle him down enough to pull a draw or a minor loss.
As the Germans, The Polish are defending front lines, and are being surrounded and destroyed with ease. Sadly, I've found they still cannot stand up to the large German units and are dying in droves..
This, IMHO takes away the benefits they have with early actives and makes for poor game enjoyment.  
Even the scenarios are so German Biased, that it's difficult to make a game of it. I just try to keep it under a major loss as Polish.