International League Legends of Heroes

Can I place a portal in a secondary castle without placing it in the main castle?

If an opponent takes my main castle, can I build up the unit generators in my other castle of the same type?

If yes, can I use the built-up unit generators after I reclaim my main castle?

1) Is it possible to put a portal of summoning in a second-rate castle, not putting it in the starting castle?
2) If an opponent takes my castle in which I build some unit generators, is it possible to build unit generators in another castle of the same type?
...
...If yes, what to do in the case of returning the lost castle?
3) If I conquer an opponent's castle of the same type as one of my castles in which I build unit generators (in what cases can I hire or/and improve my or new creatures)?

1) no
2) I think no. You built unit generators in your starting town, so it's rather clear - "not allowed to build unit generators in two towns of one kind."
3) Does the answer to this question really have some value?
On jebus, I can't imagine a situation where your enemy doesn't have all creatures built in the main town. Maybe you want to take the 2nd or 3rd town and sit there when he takes your main town... + I think I don't know any player who might have some problems if you build creatures or not...
However... I'm not really sure about this rule, but according to these words, "not allowed to build unit generators in two towns of one kind" - you can't build anything that gives creatures, and you CAN buy and upgrade everything.

No Hit & Run
If a player dealt more damage to an opponent than vice versa in a combat round, he or she is not allowed to flee. Counterattacks are not included, and the rule applies only to the first three rounds.
It is not allowed to use spells of level 3 or higher with heroes freed from jail at level 11+.