Originally Posted by SonicMonkey
There isn't really a great way to handle this. If you allow a truely persistent world...then you should be able to be attacked while logged off the game. But if those cases, how effective are your armies / cities at defending themselves? if you don't allow it then it would be simple for people to log off before a battle or something.
This is an excellent point, and I'm sure that this has come up several times in the course of development. If you log out and can't be attacked, then what's the point of it being persistent, but if you can be attacked while logged out, how will you win if you're not there?