Quote Originally Posted by Geezer57
Hi GF! Are you sure the loyalty drop is keyed to battle outcome, or is it more related to province gain/loss? I've sent any number of crappy heirs off on suicide missions, none involving a province change, and never noticed an influence difference. But maybe I wan't paying attention, either...
If you lose battles attacking, influence does drop. It may take a few lost battles and no wins before it becomes really apparent. You also lose influence if you lose provinces, whether they are defended or not.

Dunno about besieged provinces, but I reckon it would be the same thing.