A second treaty was made at Prairie du Chien, with the Winnebagoes.

The evidence

• “August 25, 1828, the United States, by Lewis Cass and Pierre Minard, at Green bay, made a provisional treat}' with the Winnebago, Chippewa, Ottawa and Pottawattomie Indians, the latter having only "squatter's rights," for lands which were permanently ceded later. Then, by our eighth treaty, made at Prairie du Chien, July 29, 1829, the Chippewas, Ottawas and Pottawattomics ceded to the United States all their land south of the Wisconsin river and covered by the Sac and Fox cession of 1804, including therefore the lead regions and also the whole of this county. By the treaty of August 1, 1829, Winnebagoes ceded the lead regions. It is said that the lead fever of 1828 was like the gold fever of 1849 and 1850 for intensity, and caused a permanent settlement of southwestern Wisconsin several years before the eastern counties were occupied.”

  1908-brown-rock-county/02-ancient-occupants.md, Vol. 1, PDF p. 39 / book p. 31

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources

• “To the northward, it reached Black river and the upper Wisconsin, in other words, to the Chippewa territory, but did not extend across Fox river, although they contended for the whole of Winnebago lake. In 1829, a large part of their territory in southwest Wisconsin, lying between Sugar river and the Mississippi, and extending to the Wisconsin river, was sold to the General Government; and, three years later all the residue lying south and east of the Wisconsin and the Fox river of Green bay ; the Winnebago prophet having before that date supported the Sacs in their hostility. Finally, in the brief language of the treaty between this tribe (which had become unsettled and wasteful) and the United States, of the first of November, 1837, "The Winnebago Nation of Indians " ceded to the General Government " all their lands east of the Mississippi.”

  1879-history-of-rock-county/01-wisconsin-antiquities-indians-territory.md, PDF p. 22 / book p. 26

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources