I noticed several times that my units lose valour during the fight if they dont kill enuff of enemy and suffer damage them self.

i.e:
My chiv. serg. intact unit, 100 men, valour 2
they kill 30 men and take 20 men in damage and then they lose 1 valour. (This is not the exact numbers im just showing an example)

So if a high valour unit takes to much damage and dont alot of enemy they lose valour. Atleast thats what i think. And seen a couple of times.

During one of my battles I saw one of my units started of with 1 in valour, go up to 3 in the middle of the battle then b4 it the battle ended it was down to 1 again.

------------------
There I see my father.
There I see my mother, my sisters and brothers.
There I see my line of ancestors back to the beginning.
They call on me and ask me to take my place with them in the halls of Valhalla where the brave may live forever.