"In Honor of Our Fathers" - "Wrath of the Heavens" [Campaign 3, Mission 3]

It was supposed to be a fairly easy mission, but because of the Haven heroes, who move around the map a lot in a single turn, I wasted a lot of time eliminating them. The problem was that the guards in the castles were tough, but the heroes themselves were running around with much weaker armies. No matter how many times I defeated them, they would respawn near the castles on the next turn. The catapults also had guards that were almost as strong as those in the castles. I tried leveling up a secondary hero, got him to level 22, but even with two powerful heroes, these guys managed to bypass me through portals and appear right next to my castle. Since I didn't want to lose my castle, I had to make a large detour to catch up with them. The same problem occurred with the gold mines. In the end, I destroyed all the cities with catapults, but I lost a lot of time because of the red dragon and only finished the map in early February.

P.S. I should have stuck to the walkthrough plan for this mission on Google. I just wanted to make it more interesting and have a good fight with the computer, but it ended up taking a lot longer