The goal is to teach them the very, very basics of formation--if they can already hold a spear and stab with it, great! Line up and be a pointy wall. If you've got a bow, go behind that. The sort of thing you can probably drill into people in a day (or two, I don't know how long we'd expect to have before the Kier show up again). Won't be able to do anything about morale, so just teach them to be a not-so-soft target.
Anything that would encourage going for the stronger, but NOT stood shoulder to shoulder with someone else targets.
Though admittedly, hopefully this village isn't too open or they can back up against something.