A lead-mining rush, called "the lead fever of 1828," occurred.

The evidence

• “But during the year 1827 mining at Fever river, Illinois, was extended into the Winnebago country and caused an Indian uprising that year. In 1828 Colonel Henry Dodge and 130 men were digging ore thirty miles within Wisconsin lands, removing the ore across the line by night. The Indians discovered and resented this. More troops having been sent, the result Avas the Winnebago war between Colonel Dodge and Chief Red Bird, the latter nobly giving himself up to death as a sacrifice for his people. 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 ”

  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