Klickitat native Jake Hunt started this religion between 1898 and 1904. This was a during a generation of northwest USA natives who were experiencing huge changes in their cultures as European descendants restricted their ways of life and access to resources. It was related to the Washani (which also uses eagle feathers) and later, to the Shaker Native American religion.
An eagle feather was held in each hand and a person would spin. Songs were sung, drums played, and feathers waved to keep time. The feathers were used to brush sickness off the body and worn in the hair in prescribed ways as reminders of the powers of feathers, or at least by association, eagles.
Quotes collected from Alice DuBois, The Feather Cult of the Middle Columbia, 1938, General Series in Anthropology, George Banta Publishing Co.