Sand Creek massacre
During a large-scale attack on a Pawnee hunting camp in 1830, the Cheyennes lost their most sacred tribal bundle, the Mahuts. It contains four arrows with influence upon wars and bison hunts. The Cheyennes left the battlefield that moment and went back to their camp, mourning all the way. In the words of Sand Creek massacre survivor George Bent, the loss of the arrows "was the greatest disaster the Cheyennes ever suffered."