the dark_
Auto-translated
I thought Gotay could defeat them in a couple of turns.
If you need help with the main steps, focus on leveling up the ballista for Gotay. It's your main strength, dealing damage comparable to centaurs. Your main forces are centaurs, paoka, and cyclops; the rest are for support and in case your main stacks are defeated. Head to the upper left corner. There, you'll find a blue castle and a portal to a red castle and a catapult. Each destroyed castle provides resources. I didn't encounter any difficulties in this mission.