The latter, it now seemed clearly established, was an Upper Yanktonais warrior named Te-o-kun-ko, or, in English, The Swift. From the statements of hostile Indians who had talked with friendlies or had surrendered to the troops during the campaign, it appeared that this man had not been with the main body of the Indians during the Summer; he had taken his family, in company with a small party of about a dozen other lodges, over into the country along the Yellowstone and Powder Rivers, in Idaho. They had probably spent the season in hunting and skirmishing occasionally with the Crows, the powerful people occupying most of that region, who were hereditary enemies of the Sioux. It must be understood that the great Sioux Nation consists of a number of different tribes, of which the Upper Yanktonais tribe is one, and the Lower Yanktonais another. It seemed that he still had with him the white boy whom he had captured in Minnesota. The lad seemed perfectly contented and was displaying such aptitude and prowess in learning to ride, shoot, hunt, and perform the other feats of skill, agility, and hardihood which the Indians regard as most manly, that Te-o-kun-ko took great pride and delight in him and was evidently trying to wean him away from any longing for his white relatives, in the hope of eventually making him, to all practical intents, a full-fledged Sioux warrior. General Sibley added that in the Spring of 1864 General Sully would almost certainly lead another expedition up the Missouri to fight the Indians, though whether he himself would move against them again was doubtful. He renewed his regrets that he had been unable to recapture Tommy, and his hopes that another year would surely see him restored to his family, and here the letter ended.