Ten days after the troops had arrived on the site of the new fort, a mere naked tract of virgin land perhaps never before trodden by the feet of white men, they were ready to leave it behind them, covered with an extensive and well-built military post which was destined to be occupied by United States soldiers for many years to come. A few lodges of Indians which had come in and surrendered at Fort Rice had confirmed the reports of those at Fort Sully concerning the great encampment of sixteen hundred lodges of hostiles assembled in a strong position somewhere near the head of Heart River or on the Little Missouri. They claimed that they had experienced the greatest difficulty in getting away from the hostile camp, and had finally been able to do so only on the plea of buffalo-hunting. They further declared that the hostiles were confident in their strength and were boasting that they would utterly destroy the army of white soldiers if the latter should venture to attack them. So there was a prospect of plenty of excitement in store when, on the morning of July 18, General Sully, unalarmed by such reports, started westward with his army with wagons loaded, troops fully equipped and liberally supplied with ammunition, and horses and mules freshly shod. Just before starting, the General went on board the _Island City_ to give some parting instructions to Captain Lamont, who was under orders to proceed up the Missouri and the Yellowstone, in company with the _Chippewa Falls_, under Captain Hutchison, and the _Alone_, under Captain Rea, to meet the column with fresh supplies when it should reach the Yellowstone. The _Island City_ was loaded chiefly with corn for the horses, but she carried also a considerable quantity of barrelled pork for the troops, and most of the building materials for the intended post on the Yellowstone; while the _Chippewa Falls_ and the _Alone_ carried chiefly rations. "Now, don't fail me, Captain," said the General, as he turned to leave the _Island City's_ deck and follow his troops, already winding out of sight across the plateau and up through a break in the westward bluffs. "My animals will probably find poor picking out in that rough country we are going through, and they'll need corn." "We'll be there waiting for you, General, if human exertions can do it," replied Captain Lamont. "But you must remember that the Yellowstone has never been navigated before, and I don't know what snags or rocks we may run into." "You can make it, and you must," said the General, "and don't forget the place you are to meet me,--the Brasseau Trading House, about sixty miles above the mouth." "I'll be on the watch for you," answered the Captain.