I'm wondering if it would be possible to allow units that are fortified within a CITY (no where else) to slowly gain experience based upon the number of turns they have been within the city and based upon the level of fortifications the city has. I was thinking with a simple Stockade, 1 point for every 10 turns per individual unit. The fort would grant 2 points for every 15 turns per individual unit and the fortress, 3 points for every 20 turns per individual unit. It would at least make non vet. soldiers stand up better when fortified against King of X regulars.

Also, could a modder allow for the creation of forts outside a city, ala Civ 4? (no unit gaining xp here though...and if so, double time at that).

This mechanic is in place in the Fall From Heaven 2 mod for BtS; though not dependent upon city fortify and buildings but simply based upon the unit type. I could imagine this would be a processing nightmare since every unit, every turn, would have to be scanned to determine if it is fortified in a city and, if so, what buildings are present in that particular city.

Alternate idea: Have the fortifications also open up slots for "training" so, like education, you can place a unit into the fortification slot and after a few turns have it get XP (limited, you can only learn so much from training).

Alternate idea: Have the fortifications also open up slots for "training" so, like education, you can place a unit into the fortification slot and after a few turns have it get XP (limited, you can only learn so much from training).

Hadn't thought about the possibility of a processing issue. I like your idea better though as it seems to be simple and still produces the effect I am looking for. Just have to figure out how to implement this.:goodjob: