Addressed:

    Maj. Colley, Indian Agent Fort Lyon

    Cheyenne Village Aug. 29^th/64
Maj. Colley.
        Sir
    We r received a letter from Bent wishing us to make peace. We held a consel in regard to it & all wo(?) came to the conclusion to p [actually just the upstroke of the letter p-chw] make peace with you providing you make peace with the Kiowas; Commenches, Arrapahoes Apaches and Siouxs.
    We are going to send a messenger to the Kiowas com and other nations about our going to make [peace] with you. We heard that you [have] some prisoners in Denver. We have seven prisoners of you which we are willing to give up providing you give up yours.
    There are three war parties out yet and two of Arrapahoes. they have been out some time and exspect now soon.
    When we held this counsel they there were few Arrapahoes and Siouxs present. we want true news from you in return, that is a letter.                       

Black Kittle &
                   other Chieves

Source:

Black Kettle, "Black Kettle's Letter to Major Colley", Sand Creek Papers, 1861-1864, Colorado College, Tutt Library, Colorado Springs, Colorado, Special Collections and Manuscripts, File: Mf 0018, 1864, [7 items (1 env.) Summary: Letters and circulars related to the Battle of Sand Creek. Among the correspondents are Governor John Evans, Samuel G. Colley, and Black Kettle.]

    Images of all the documents are posted here:

    Sand Creek Papers, 1861-1864