The Traditions of the Hopi, by H.R. Voth, [1905], at sacred-texts.com

108.--A HOPI RAID ON A NAVAHO DANCE.

Many Navaho go to deep canyon to have Katcina dance. During fifth dance star falls down in front of head dancer. Navaho are much afraid, jump on ponies and begin to scatter. Great noise is heard and Oraíbi arrive to make raid. Great battle ensues. Navaho are driven back out of canyon and few escape to their homes. This is why Navaho when they dance always have watchers,