One thing to note: If armor would reduce the damage below 10% of the attack damage it stays at 10% Attack damage. For example. 500 defence and 400 attack - it would still deal 10% so 40 damage (from 360 armor upwards) no matter how much higher the armor is.
Also physical projectials like arrows or bolts can be deflected if the ATK of the ranged unit is lower then the defence.
Disclaimer: Dont be mad im gonna do some naziĀ“ing now.
*Magic Resistance not Reduction
*% percantage = percant percantage - scrap one its doubling