Round table

Well, the first one isn't too difficult. We use two stacks of air units to distract the demons as much as possible, attack with archers, and finish off the remaining stacks with cavalry. On the third attempt, I lost 3 air units, 1 swordsman, and a single spearman. I couldn't complete the second one in 3 attempts. I think that in a real game, relying on 30 minotaurs with 15 elves, 40+ captains, and 6 wood units + basic ranged attacks is a very bad idea.
As for the Gorgon, if you don't have a lot of troops at the start, I don't think you can take it on level 111.