The most challenging campaign.

Honestly, I didn't understand where the hero Isabelle came from in the Demons Campaign. The third mission is really difficult... because that jerk, Gilraen, even with a smaller army, still defeats you due to the lack of morale in your warriors and due to sheer luck.
I passed it like this: I gathered a large army and captured all his cities, snatching the last one right under his nose. He was within one move of the city, and I was inside; he was afraid to attack me, so he ran to another of my cities. I grabbed the reinforcements and chased after him. As soon as his turn came, he saw that the city was free and ran towards it, but he didn't have enough moves, while I had plenty)). I entered the city again, and it all started over... for 7 days, and then he lost like a poor elf.
P.S. The second time I replayed, I finally killed him.