fellas,
Cameroo, I believe the whole idea was to inflict as slow and painfull death as possible.
Osage, Dont know about the splinter part, but do have a report in Otis Mason's book written by a U.S. cavalry officer where he reports that an Apache ambush resulted in the arrow death of a junior officer, when autopsied the arrow was discovered to have no head, just hardened wood sharpened to a point. The same books report that Lewis and Clark reported back to the Smithsonian that several tribes they incountered could shoot "headless" arrows 6 to 8 inches deep into pine logs. So, I suppose the headless arrow was wide-spread.