Originally posted by pithorr
I don't think further limit for seized provinces is the right way to more realistic model.
I think rather about increased maintenance cost for armies, harder "war exhaustion" factor and harder strongholds availaible to build in the beginning of the game period (In 15th century castles were already huge and till design of heavier cannons almost invincible). Strongholds' endurance should be balaced with technological level of land troops sieging it. It could be better not naming them by levels. Istead of it they should rather be: wooden fort (for colonies only, stone keep, stone castle, bastion, fortress, citadel etc. Technological advance could enable you to build more suitable updated fortifications, however you would be able to erect some smaller (for less money) if you want.
Trouble with increased maintenance costs is that this is a symmetric solution - the aggressee suffers from it as much as the aggressor, and the aggressee is the one most likely to run out of money first as his provinces start getting occupied.
So this won't do much at all except make sure that the battles are fought with smaller armies.