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60 by 60... or something like that.
Most likely, Dryads (upgraded) and Dwarfs (upgraded) will overwhelm the Skeleton Archers, but I'm not sure about the Goblins; I don't remember their stats, but they're probably equal.
If the Skeletons can kill, then they can kill Imps and Peasants, and possibly Goblins, when they appear. Although, I'm not entirely sure.