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I managed to approach Drakarosh and defend myself there against Yorogos with an army of snipers + fanatics + cyclops + archers (I gave the champions to another hero, they only get in the way in this battle). I divided the snipers separately into groups of 20 (to kill the ballista) + 50 (to kill the catapult) + 2 equal groups. In the first turn, the machines, red dragons, and cyclops die from the snipers' arrows (the griffins are blinded), and that's it... the battle is won without any losses, because the rest can't hit anything behind the barricades.