 Tensions rose, and in May 1877, General Oliver Otis Howard called a council and ordered the non-treaty bands to move to the reservation.Chief Joseph considered military resistance futile, and by June 14, 1877, had gathered about 600 people at a site near present-day Grangeville, Idaho.But on that day a small group of warriors staged an attack on nearby white settlers, which led to the Nez Perce War.