Auto-translated
I played this mission in version 3.0. I immediately noticed that the AI had become smarter. The sea raiders combined all four of their armies into one hero. Instead of going to die by attacking the castle, they really messed me up. They looted the mages' treasure, returned to their ship, and killed all the neutral creatures on the nearest island. And they probably did some damage on the larger island as well. I barely had enough neutral creatures to fully upgrade both of my heroes. I remember that in version 1.5, there were no problems with upgrading.