All these soldiers, over one thousand in number, constituting the First Brigade of General Sully's army, were quartered in the barracks of the fort or encamped close around the stockade. The buildings of the fort, which were similar to most of those built on the Northwestern frontier, were of large, unhewn cottonwood logs; and the stockade, about two hundred and seventy feet square, was made of cedar pickets rising twelve feet above the ground, loop-holed for musketry and flanked by two bastions, one on the northeastern and one on the southwestern corner, containing cannon to sweep the faces of the stockade. It had been built by General Sully's troops, many of whom were still there, at the close of the campaign in 1863. A short distance out from the fort were several hundred lodges of Indians, recently hostile, but who, wearying of the struggle, had come in to tender their submission to General Sully. Al, through interpreters, made eager inquiry among them for news of Tommy, but could learn nothing. The Indians, who were of several different tribes of the Sioux Nation: Yanktonais, Brules, Two Kettles, Minneconjoux, Sans Arcs, Uncpapas, and also Blackfeet, reported that the hostiles were gathered in one immense camp of some eighteen hundred lodges, or about six thousand warriors, three days' march west of the Missouri on the headwaters of Heart River, and that they were eager for a fight. After a few days spent at the fort in organizing and refitting the troops, shoeing the horses and mules, repairing harness, and loading supplies for immediate use into the train of nearly one hundred wagons which was to accompany the column, the latter moved out on its northward march on the twenty-third of June.