Not all night. I lost the whole Saturday with that thing. :(
The 1k mod is somewhere on my hard disk. I don't remember where i got it but it was hard to find.
The walls... You need a lot of firepower, not only to break them, but to break the army of ranged attack units that is defending it. Like 300 Long range british archers with (that unit that launches a single rock over great distances, don't know the name in English), and plain trajectory catapults. Let alone the filled towers and cannon towers.
My friend lost like 7000 units in that siege.
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )