I can see how what I said was confusing, thanks for the response.

"Inspired by the drive for war beneath a bloody banner, the banner's
bearer also gains an extra attack with their weapon."

This indicates I should get an extra attack when using a banner I do not and in this particular example I used a dwarf banner (From a player corpse ... Only way you can get them) against a dwarf NPC and noticed an improvement in damage (So I assume banners work when fighting NPC's) but not once noticed an extra attack. One attack a round happens very frequently and three attacks a round is the max when according to the help file I should see four.