The Arikara Scouts at Fort Lincoln,
According to Libbie Custer: section 3

"Bloody Knife was naturally mournful; his face still looked sad when he put on the presents given him. He was a perfect child about gifts, and the general studied to bring him something from the East that no other Indian had.

He had proved himself such an invaluable scout to the general that they often had long interviews. Seated on the grass, the dogs lying about them, they talked over portions of the country that the general had never seen, the scout drawing excellent maps in the sand with a pointed stick. He was sometimes petulant, often moody, and it required the utmost patience on my husband’s part to submit to his humors; but his fidelity and clerverness (sic) made it worthwhile to yield to his tempers."