From what I remember there are towns where units are generated at every 3-5 weeks depending on the type of unit, those are the important places I think.
I'm not sure about the victory conditions, when all such towns are captured, or when every unit is destroyed, but I think the towns are the goals, that would make more sense. A handful of forts are also dotting the map, which are extremely hard to capture, proper artillery is needed, which isn't easy to produce (especially with all the other fighting is going on, all demanding more and more units).
The positions of both sides have strong points and weaknesses. The Hugarians are located centrally, making it relatively easy to move (fresh) units to the different fronts around, but they have to move those units around to prevent the enemy becoming too strong on one front and their pushing into the country from that direction. If one front is lost, the country will be lost.
For the imperials on the other hand regrouping units from one front to another isn't easy, tho fronts can't support each other but one way, tying up Hungarian forces. If one front is lost, then Hungarians can regroup from there, overloading the next and the next (in theory).