The one who does it for a handful of gold.
I glanced at that battle with harpies and pikemen. My initial thought is that one gnoll should huddle in the upper corner and defend against one stack of pikemen, while the other runs around the remaining two stacks near those Cove areas. When the first gnoll deals with the first stack of pikemen, somehow divide the two remaining stacks between the gnolls.
If this is one of the correct strategies, I’ll try to figure out this battle. If not, I won’t even try.
To kill the hero with archers, we need three gnolls, not two (this is not a joke).