(Sounds like the most dangerous law firm ever.) They include all of the houses that are listed in the Appendix in the Stark entry: Karstark, Umber, Flint, Mormont, Hornwood, Cerwyn, Reed, Manderly, Glover, Tallhart, and Bolton. The Stark bannermen are those noble lords of the north that follow the Starks in this case, the guys that follow Robb Stark in to battle.
