Well, the zombies have 36 HP, the other type of zombies have 48. That's kinda low in my opinion if I am to avoid big losses in some of the fights. In addition to that, their initiative is really low - 2 for normal zombies, 1 for the better ones.
As for losses... you need to minimize them, because you don't have an ample supply of those units all the time. They're found on nameless and a few other islands.
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