Hello romanip, welcome to the .Org . You may want to check out the EB forums over here: the power of gaesatae is an old topic of discussion. Short version: Gaesatae have two hitpoints to represent the effects of the pain-numbing drugs. This means that, despite having little armour, they have considerable durability in a melee fight. However, low armour makes them vulnerable to missiles, especially in their rear or unshielded side, and cavalry charges. Gaesatae also cause fear in enemy infantry but not cavalry.