[3] He was the only council chief who remained with Black Kettle following the Sand Creek massacre of 1864.
In August 1868, Little Rock was interviewed at Fort Lyon by Indian agent Edward W. Wynkoop about raids by a large Cheyenne war party on white settlements along the Saline and Solomon in Kansas.
Little Rock gave Wynkoop information about those responsible for the raids, which included members of several different Cheyenne bands including that of Black Kettle, and agreed to try to persuade the other Cheyenne chiefs and headmen to surrender the raids' leaders to U.S. authorities, in accordance with the terms of the Medicine Lodge Treaty.
[5] With Black Kettle, Little Rock attended a conference at Fort Cobb, Indian Territory (present-day Oklahoma) with Maj. Gen. William B. Hazen on November 20, 1868, at which Black Kettle sought but was refused permission to come in to Fort Cobb in order to avoid war with the U.S. Army.
Little Rock, whose lodge was at the eastern edge of the village, joined with the Cheyenne warrior She Wolf and a visiting Kiowa warrior Trails the Enemy to form a rear guard to protect women and children fleeing downriver from attacking cavalrymen, believed to have been a detachment under Maj. Joel H. Elliott.