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Voytek is right. With 2 stacks of copies, the battle becomes easy to win. You reduce 3 stacks to 1-2 units per stack (while sending units to fight against the centaurs and elves), then you don't touch these stacks, defend with pikemen, and simultaneously shoot down the remaining stacks. In the end, you finish off those first stacks. In general, battles specifically against Cerberuses are very interesting.