From: Rapid City SD
For some reason I couldn't place my new infantry unit in Trento???
You cannot deploy new units in "minor cities", that is cities and fortresses with 0 PP production (hold space bar to display PP production).
I think buying only Armies (Infantry) and not Corps (Garrisons) does make things harder
Reading through the last pages of the AAR I was gonna comment on that too. Congrats on the swift defeat of Serbia! I'm happy to see that didn't instantly win the game for you though, meaning there is a downside to overfocusing on them ;)
But it's vital to balance between infantry & garrison forces. Look at Infantry as your first grade, large size combat units, and garrisons as secondary quality reserve forces. You do not have enough resources to have Infantry everywere. Use garrisons in places that are already well entrenched, not instantly treatened by a strong enemy force or of lower importance.
For example you have 5 Infantry + 1 Garr holding the line from Koenigsburg to Warsaw. The Russians oppose it with 3 Infantry & 3 Garrisons. That means you are paying 5 * 4 + 1 * 2 = 22 PP, while the Russian defense costs 3 * 4 + 3 * 2 = 18 PP.
The position is well entrenched by now so try replacing some infantry with garrisons there (not the exposed one near warsaw!) to free them up for more important duties. It will make the line more vulnerable when the Russians do decide to pressure it, so always try to be prepared to shift your reserves!
And Bulgaria will join the war next, with Serbia already out of the war those troops will be very useful elsewere :)
After that you'll have to deal with Romania, which often weakens the russian more than it helps them (as it did in reality) because it vastly extends the eastern front, and Romania has not enough strength to cover the whole gap.
So hang in there! :)
Thanks for answering the deployment question. Serbian would of still fallen even if I would of taken 2-3 units north to Italy. That was a error on my part.
As for the information on PP upkeep, thanks a lot for the information. I have seen the error in my ways!