Bunch of Tigermen attacking me right now. They're all armed but are wearing nothing but helmets and mail shirts. Is that usual? My archers tend to aim for the knees, so I doubt anyone will be left standing by the time they reach the gate.
That's normal for now because typical fortress invaders don't use any other forms of armor. Enemy soldiers will at most wear pants, which barely afford protection and clutter up the loot piles.
That said, I did not intend White Tigermen to be the toughest of the invaders. Other invaders use a custom armor that protects the entire body, or are resistant(-ish) to arrows. That said, it would not be impossible for me to release a version of Fortress Defense where enemies all come wearing Full Plate. I could also make the units not bleed, by tacitly them turning into metal.
Pasting the following tags:
[TISSUE:IRON]
[TISSUE_NAME:iron:iron]
[TISSUE_MATERIAL:INORGANIC:IRON]
[MUSCULAR]
[FUNCTIONAL]
[STRUCTURAL]
[RELATIVE_THICKNESS:1]
[CONNECTS]
[TISSUE_SHAPE:LAYER]
[TISSUE_LAYER:BY_CATEGORY:ALL:IRON]
Below where you see
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
Will toughen the skin of most creatures. Replacing their tissue entirely makes them into the equivalent of bronze colossi. I could release a mod that could be applied to your current fort, where all races are this tough.
Though, isn't the reward for training archers the slaughter of enemies weak to them?
edit: "that said" intensifies.