The pledge was uttered by Nez Perce chief Joseph (c. 1840–1904) in 1877.
It was part of a larger statement made when his fugitive tribe surrendered to the U.S. Army following a long, grueling journey as they attempted to flee to Canada.
The exact quote is, “Hear me, my chiefs, I am tired; my heart is sick and sad. From where the sun now stands, I will fight no more forever.”