Previous to April, 1858, Dakota Territory for a century or more had been the hunting ground and undisputed possession of the Yankton Sioux. However, for some years before this date many adventurous, enterprising members of the white race in the adjoining states of Iowa, Minnesota and Nebraska, had cast covetous eyes across the borders. Not a few even followed their eyes and entered in spite of the prohibition of the government and the hostilities of the Indian. Many more, encamped along the borders were watching the negotiations between the government and the Yanktons, eager and alert to step over the line the very instant the door should be opened. According to the available data on the Indian history of this region, previous to 1750 it was occupied by the Omahas, who held the Big Sioux and James river valleys. These were driven out about 1750 by the Teton Sioux, who came previously from the woods of Minnesota. The Teton Sioux also engaged the Rees, then having strongholds on the Missouri, especially in and around Pierre, and after a forty years' struggle drove them north to Grand River and then to where their remnants are still found in the vicinity of Fort Berthold, North Dakota. At this time of the Treaty, this region was held by the Yankton and Yanktonais Sioux, who had been driven from western Iowa by the Ottos about 1780 and had settled the lower James River Valley. The first attempt at a settlement at Yankton was made in the spring of 1858 by one W.P. Holman, his son C.J. Holman, both of Sergeants Bluff, Iowa, and Ben Stafford, together with four or five others from Sioux City. In anticipation of an early treaty these men came up on the Nebraska side of the river and, crossing over at Yankton, built a camp. But about a month later the Indians, jealous of their hunting grounds and suspicious of the designs of the intruders, drove them back across the river.