Ending the discussion, Grattan began walking back to his column. A nervous soldier fired his gun, shooting a Sioux. The warriors started shooting arrows while leaders tried to take control. Conquering Bear was mortally wounded and died nine days later near the Niobrara River. The Sioux warriors quickly killed Grattan, 11 of his men, and the interpreter. A group of some 18 soldiers retreated on foot trying to reach some rocks for defense, but they were cut off and killed by warriors led by Red Cloud, a rising war chief within the Sioux. One soldier survived the massacre but later died of his wounds.