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Since you requested it, here's how to take the Hive on the FIRST try (without using the "lucky strike" ability, without morale boosts for the Elven army, and with only one morale point for the Flies): 44 Centaurs remain!!! (Without the Elves, it would have been even worse; if the Centaurs had even one lucky strike at the beginning...).
I don't even want to try against Ogres if they have even a +1 morale and +1 luck bonus; with good terrain, 29 Ogres can deal a lot of damage.