I am rereading one of my ATF trilogies - The Deed of Paksenarrion by Elizabeth Moon. I haven't read in a while since my paperback is getting fragile and I can't find an ecopy for my nook (which really surprises me).
Early in the first book, Sheepfarmer's Daughter, Paks is on her first campaign with the Duke's mercenary company. When Stammel sends Paks down a path to setup their campsite, he says "Stay on the path; we don't want the tribe angry with us". I don't believe there has been any reference to any tribe at this point. Who are 'the tribe'?