The fight for the goblin fort was always intended to be pretty brutal, but now that I've decided to go back and add in some attrition in the shield-wall before the close-combat fight starts, I've realised that I need a lot more Glade Knights.
I've had a bit of time today and yesterday to crank out some more warriors for the battle: Now I just need to go back and slip a few of them into the earlier build-up scenes.