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I was just training: took a Griffin Conservatory tier 3 with 2 angels, 46 marksmen, and 48 peasants + a few griffins, Valessa level 1 with expert Archery (no other skills), stats 5\5 without a tome. Managed to come up with a tactic where roughly 1 out of 3 times (with no morale on either side) both angels and all marksmen survive. In reality, by week 2 Valessa is usually at least level 5-7 and often has Defense or Offense; in that case, I think the Conservatory falls without losing angels almost 100% of the time. But with the cavalry variant, unfortunately at least 2 cavalry die no matter how hard I try. So that's it ).