Well, it served the indians pretty well. Out here they chose bows over guns. The only reason the U.S. ever won, was, A, they had more people, even though one indian quickly outfought 5-10 whites, and B, the first repeating rifles and revolvers were invented....with respect to A and the indians being such good fighters, in some of the spanish skirmishes in the south and southwest, my thought is that, the spanish were shipping new and foreign guys from spain over to the gulf coast, whereas the americans had came from ancestors who migrated progressively from the east as frontiersman and indian fighters over the last couple hundred years...those guys were born and seasoned at a young age. In order to get through the indians, and especially some of their ancestors who got through the shawnee, they had to be some lean mean fighting machines...
To bring this post back to the era though, i have read multiple accounts of the british complaining that the americans were more indian than white in certain regions...even to the point of dressing like them (think of guys in the region of ohio, Kentucky, indiana, and North Carolina, like Sam Brady and his scouts for instance, along with others,...ambushing and giving war whoops with their guerilla tactics inspired from the natives and wearing indian garb...it was common fighting knowledge of the era, and battles were won by the americans by spreading out widely and whooping during a sudden ambush to overwhelm the british, who were much intimidated by only a few guys.