The french Arbaletrier have the ability to use a shield that gives additional +5 ranged armor. The calculation of the armor is wrong. When using the ability it sets ranged armor = 5. If you have researched ranged armor in the blacksmith which goes up to +3 it still sets ranged armor = 5. This bug causes french arbaletrier to have lower armor and using the ability is therefore most of the time not usefull.
It is possible that only the ui has the error. I have not checked if the actual damage reduction works correctly.
Version: 5.0.9369.0