The question is regarding the fortresses. If they each pay +1 VC for each turn that they are on the map and your race is active, then they become quite powerful because the VC will be building exponentially. Is this the case, or do they only each pay one VC on the turn that they are placed and then are only good as a defensive bonus for there on out?
They work at the end of each your turn (not only when they are placed).
Even if it might by ambiguous in the Smallworld rules,
Once per turn, as long as your Fortified Race is active, you may place 1 Fortress in a Region you occupy. The Fortress is worth 1 bonus Victory coin at turn's end, unless you are In Decline. The Fortress also augments your Region's defense by 1 (just as if you had an additional Race token stationed there), even if you are In Decline. Remove the Fortress if you abandon the Region or when an enemy conquers it. There can only ever be a maximum of 1 Fortress per Region, and a maximum of 6 Fortresses on the map.
- Everywhere else, symbol +1 VC on a land or token (such as Fortress) says that it works each turn.
- If it were only about the end of the current turn, then the sentence at turn's end, unless you are In Decline wouldn't make sense (as you cannot place anything when you are in decline, unless you are Stout, but you cannot be Stout and Fortified at the same time).
At the end of each turn where your active race occupies a Fortress (including the turn in which it was placed), you get 1 point for each occupied Fortress.
This is not an exponential point growth. For example, on the third turn you held a Fortress, you do not get 3 points, you just get the standard 1 point each turn.