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Regarding the number of units of rank 2, I can say for sure... if they are given at all, then only within these limits.
Archers 3-5 (min/max)
Orcs 3-5 (min/max)
Dwarves 2-4 (min/max)
Gargoyles 2-4 (min/max)
I'm not 100% sure about the first rank.
Peasants 31-49 (min/max)
Goblins 12-25 (min/max)
Butterflies 10-20 (min/max)
Centaurs 6-10 (min/max)