Dirty_Player
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The best losses were as follows:
Castle: 26 spearmen, 0 archers.
Rampart: 8 centaurs, 0 elves.
Tower: 4 gargoyles.
Necropolis and Dungeon: about 12 skeletons/trolls.
Swamp: I don't remember, but everyone left something there.
Conflux: when testing, the losses were only 10-11 sprites, 0 aerial units, 0 fish, but it was such a battle that it heavily depends on the damage spread, and most likely you will have to sacrifice 1 unit (an aerial unit or a fish).