Something I'd like to see in a mod: (if it hasn't already been done)
Advanced siege warfare. The siege warfare in Civ4 is a bit lacking. All you can do in civ4 is surround the city, bombard it to death, and attack. But there were many more ways of sieging a city in the medieval ages.
1. Blockading
Armies would often cut off supplies to a city and slowly starve the people inside.
In-game: I was thinking that some land units outside of cities could have the option that naval units have, to cut off trade to a city.
2. Additional siege projectiles
Catapults in the medieval ages were often loaded with diseased corpses to spread disease inside cities. Maybe there could be an added option to spread 1
with a catapult/trebuchet.
3. Siege towers
This has already been done--having a siege tower which has a random chance of destroying the walls in a city. I was thinking it could be expanded so that the siege tower can hold one other unit and at the same time as breaching the walls unload the unit to attack the city. the siege tower could be countered by a building like a moat maybe?
4. Mining
This is the most important one. A swordsman walks up next to a city and then digs for four turns. When he's done digging, there's a random chance the walls are destroyed. This happened alll the time in the middle ages when attackers tunneled underneath castles and set them on fire.
5. Better bombarding
It seems that most of the siege weapons in civ4 have a bombardment option that lowers defenses--but that's not what they were used for, mostly. A lot of siege weapons were used to spread damage/disease and kill the occupants of a city, including artillery of ww2. perhaps this could be made an option.
If anyone knows how to make a mod with those additions, or knows of one that's already been made, please tell me! thanks in advance