You might be able to win if you take some initiative artifacts so that your rogues get two turns before the wardens and you don't let the chargers hit the goblins. Try to copy the strategy and talents of the player in post #2.
PS: I don't have all constructions for my level but these are tougher compared to single faction quests.
Eg: Vanguard of Knights {2} https://www.lordswm.com/warlog.php?warid=783400417
Piece of cake. :)
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