Cactus Game Design Message Boards

I've been unknowingly using a second edition rule book to answer all my ruling needs, but I see that its kinda outdated especially when it comes to fortresses. 
I was wondering what the rules are in regards to fortresses like Kerith Ravine and other ones that allow heroes to be put in them. 
Like, when exactly can I put heroes in them?
Can I put one in there, and in the same phase take it out again if I change my mind?
If I have a fortress in play holding heroes, will a band all heroes into battle enhancement remove those people from the fortress?
Also can I band to heroes that are inside fortresses?
How many fortress cards am I allowed per deck?  1 because it looks multicolored?  I don't know any of these answers please help.

Ok awesome.  Also, how does the Promo Goshen Work?  Is it like a Chamber of Angels for Genesis, Exodus Heroes if they get defeated in a battle of numbers?
Can other heroes be put in it?
And say if I have Gates of Samaria in play and I somehow fetch a Samaria site from my deck.  Would I be able to instantly zap a character with the -6/-6 proc ability of the fortress, provided I have an evil king of Israel in play?
Is when I can tinker with placing heroes in and out of fortresses during site maintenance phase, or is it sometime else?