Particular care should be taken that every promise made to them [the Navajo and Mescalero Apache] should be observed to the letter. In this way I am … - Kit Carson

The government now tried coercion and vigorous campaign reduced a portion of them [the Navajos] to apparent submission. Again a treaty was made... Another and several other expeditions were organized, all ending and being followed with like results, not because the troops did not bravely energetically and intelligently carry out their instructions; but because the policy adopted was erroneous.
The last and perhaps most successful expedition sent against them under this policy, was that of 1860-61 under command of Bvt. Col. (now Brig, Gen.) E.R.S. Canby, U.S. Army. The treaty made on this occasion was signed by twenty-two Chiefs, a greater number than on any other previous occasion. From this fact and other concurrent causes, it was believed that permanent peace and security was at last bestowed on the Territory, and commensurate to the boon was the joy of the people.

Owing to the strength of this [the Navajo] tribe which numbered then not less than sixty or seventy thousand (60 or 70,000) souls embracing as it did some of those Indians who now call themselves 'Apaches' but who still speak the same language, and who are so alike, and to the fact that they inhabit a country equal to one-third of the whole Territory; that this section was a 'Terra Incognita' and that there is no portion of the American Continent so well adapted by nature for the peculiar style of warfare adopted by the Indians, it is not at all surprising that the many powerful campaigns made against them by the Spanish Government were entirely barren of results as to their subjugation.

Jis' to think of that dog Chivington and his dirty hounds, up thar at Sand Creek. His men shot down squaws, and blew the brains out of little innocent children. You call sich soldiers Christians, do ye? And Indians savages? What der yer s'pose our Heavenly Father, who made both them and us, thinks of these things? I tell you what, I don't like a hostile red skin any more than you do. And when they are hostile, I've fought 'em, hard as any man. But I never yet drew a bead on a squaw or papoose, and I despise the man who would.