Shield protection

[Yrkoon]

Hi,

I was wondering what happens when a blow is successfully blocked by a shield. What protection is used to determine the damage taken ? Shield protection only, or shield + armor ?

Example :
a giant (strength 18) with a glaive (damage 7) hits a guy with a shield (protection 15) in chain mail (protection 9).

how much damage is dealt ? Is it:
((18+7)+2d6) - (15+2d6) = 10 +2d6 -2d6
or
((18+7)+2d6) - ((15+9)+2d6) = 1 +2d6 -2d6
or is it something else ?

I just want to know if troops that do a lot of damage with a low-ish attack fare well or poorly vs shield wielding troops. In the first case, even blocked, the blow would probably kill the defender. In the second case, the defender would surely survive.