Some V&Vs affect the entire army, some affect the general's unit and some affect just the general himself. I don't think you can say that all valour related ones are of the same type.

e.g. there is one virtue about the general being good in personal combat, in that case I think it is just him who gets the valour boost, whereas the one about him inspiring great deads in his men affects his unit. There is no valour related V&V that affects a whole army's valour (unless you count command rating V&Vs).

I think all morale-related V&Vs affect all the people under the general/captain, so if it is a general who has it, the whole army gets the morale boost, if it's a captain, then it's just the unit.