" Pretty cool era for mounted archery, excepting 1750 and earlier! What a cool Olympic sport that would be, too..."
Where I live, mounted shooting is becoming very popular, perhaps mounted archery will be next. A very fun spectator sport as well.
"I don't think PNW Natives had much use for hunting on horseback, the horse was late to come to the area, because they weren't as big on hunting big game and had no real need for horses."
Uh, how about the Nez Perce? (PNW Indians that traveled on their well bred Appaloosa horses) to search out and hunt the buffalo, read the logs of Lewis and Clark,...... the Shoshones were horse people of Montana and were driven into the mountains but traveled by HORSEBACK to hunt on the plains of Montana.
Have you ever ridden out in the woods amongst the deer? You cannot walk amongst the deer but you sure can ride amongst them because they let down their guard when you are on a horse and you can get closer. Would you consider a mule deer small game?