Yes, this mission is even more challenging than the previous one. After unsuccessfully running around the entire map trying to capture another town, I decided to give up. I leveled up the heroine quite well, but it wasn't enough. Fighting heroes with a "high" difficulty level is only feasible in an open field. Therefore, I'll complete this mission on the easy difficulty level, and I'll do the same for the rest of the campaigns until I come up with the perfect development strategy for the heroes in each campaign.