I do not have any suggestions regarding the gameplay for now. I'll have to play a couple of games on the map first.
On the other hand, I still have suggestions about the graphics, if you don't mind.

-The yellow texts seem to be too emphatic and a bit distractive to me. Yellow is good for the title, as it has to stand out, but the rest of the texts should be less highlighted. I am wondering if you could use text colours that are less distractive, but still visible.
I think it would worth a try, if a dark/light shade of the actual background would better look than the current yellow texts. E.g. light green text on the green lane, brownish text below the flag, black/grey text on the white lane of the flag. I think it would match more with the colours of the map and would look better.
- The colour of the flag could be a bit lighter, as the middle lane is rather greyish than white at the moment.
- I would also suggest to put the "3" of the "3 million Hungarian" to the next row (i.e. "3 million"), so that the number of armies on Vas are further from the number in the legend.