Reduced his merchant fleet to zero. I'm convinced the AI cheats because he STILL had a huge exports and overseas profits rating. How in the world was he getting that?
The game is "lazy" in how it was coded, as are many games from this era. The bottom line is that systems like cashflow and trade aren't complete systems. If they were, the game developers would have had to figure out a way that a minor nation selling 15 timber per turn could afford that 45 clothing they buy every two turns.
So he was able to maintain 30 heavy artillery in his capital. Once an AI turtles like that it becomes 100% impossible to ever take it no matter how huge your army is (I couldn't even get one unit into firing range).
Two options:
- Move a general into the first tile the enemy can attack, at either the top or bottom of the screen. This opens him up to be attacked by one diagonal row of artillery at a time. Then, move as many heavy artillery into this same row as you can. On the next turn, they will get the first shots on your artillery, but you will be able to pop some of theirs into the yellow/red. Once this happens, if they can't retreat (which they can't because the fort is packed), they will surrender. You can then retreat, heal up, and do it all over again.
- Attack the capital with 8-10 mobile artillery. Move them all the way to the back of the battlefield. If the AI decides that they are powerful enough to take you, they will move units out of the fort in a nice little, strategically-inept single file. Heavy artillery coming for you cannot move and fire in the same turn, so you are able to pop off the ones they send out front first. Eventually, you will either be forced to retreat to protect your units, or they will stop coming at you. If they stop coming, just retreat units one at a time until they continue to advance. Rinse and repeat these attacks as many times as you have to.