Problem with Haven.

15 Knights of Isabel with one attack took down 8 out of 12 black dragons without any luck, only the hydras held out a bit, the rest fell quickly.

It seems a bit weak, if you managed to gather 12 dragons, there should already be thirty knights, this is if people don't have enough money, but if they have enough, they should at least retrain 3-4 per week, then there will be closer to fifty, such a large number can probably only be defeated with cunning.