The origins of the custom of scalping enemies are unclear-it may have been introduced by Spanish conquerors in the 1500s, or it may have begun as an ancient Indian tradition. The practice increased dramatically among Indians and Europeans in the 1700s, largely as a result of the Indian scalp bounties set by local authorities as a way to encourage settlers to help fight hostile Indian tribes. The Indians retained scalps as war trophies and offerings to spirits, or wore scalp locks on their belts as warning to their attackers. Shown here are two Indians from the Southeast displaying their trophies.