The second expedition up the Platte Valley was ordered in 1819 by John C. Calhoun, Secretary of War for President James Monroe, and was under the command of Major Stephen S. Long, of the corps of topographical engineers. Leaving Pittsburg, Pa., in April, 1819, Major Long proceeded westward and established his camp near the present site of Council Bluffs, Iowa, to which was given the name of Engineer Cantonment. Thence on June 6, 1820, with a number of scientists and a small detail of regular troops, he marched toward the mountains. On June 30th the party sighted the magnificent range of the Rocky Mountains, a view of which burst upon them in the full glory of the morning light. On July 3d they passed, as Long's annals read, "the mouth of three large creeks, heading in the mountains and entering the Platte from the northwest." These were undoubtedly the Cache la Poudre, the Thompson, and the St. Vrain. On July 5th they camped on the present site of Fort Lupton, and on July 6th on the present site of Denver, at the mouth of Cherry Creek. Thence the party followed the valley to the Platte Cañon, and, proceeding southward along the base of the mountains, returned eastward along the Arkansas. [Illustration: BUFFALO BILL'S FIRST SITUATION.] Twenty-two years later, in 1842, came Lieut. John C. Fremont, the famous pathfinder, who traversed the Blue toward the Platte, reaching the valley at Grand Island, a portion of the party going up the North Fork toward Fort Laramie, and the larger part marching up the South Fork to Fort St. Vrain, which had then been established a number of years, and had become a noted rendezvous for trappers, hunters, and plainsmen. The following year the intrepid explorer left St. Louis on his second expedition, traveling the valleys of the Kaw and the Republican, reaching the Platte at the mouth of Beaver Creek, and arriving at Fort St. Vrain on July 4, 1843. I quote the words of Lieutenant Fremont as prophetic of the future of the valley. "This post," he says, "was beginning to assume the appearance of a comfortable farm. Stock, hogs and cattle, were ranging about the prairie. There were different kinds of poultry and there was the wreck of a promising garden in which a considerable variety of vegetables had been in a flourishing condition, but had been almost entirely ruined by recent high water."