Hello! Some questions about castles, please.

[BigJMoney]

I'm obviously new around here (love what you've done with the place ) and I had some questions about castles. I've looked all through the forums, and various fan-sites for HOURS now to get all the info I could before posing questions. Here goes:

What does this ROI stand for? I see you guys using a lot. I've figured out most acronyms, such as PD and MR, but this one has be baffled.

I've seen someone say that the Mountain Citadel has 32 "missile points", but when cosulting the manual, it says my Caelum Empire only gets 8 shortbows to defend a castle with. Does this mean that I can recuit up to 24 more archers to put in defense of the castle? Also, how do mages and priests function to defend a castle? Can they cast spells over walls?

Thanks for any answers,

=$= Big J Money =$=