1834
By 1834, 4,591 Winnebagoes had settled north of the Wisconsin river, unwilling to cross the Mississippi to their new Iowa reservation.
The regionGrade A · 1 independent source
The evidence
“They were also given a tract of land west of the Mississippi and promised, after they had moved, $10,000 each year for the next twenty-seven years. By 1834 Winnebagoes to the number of 4,591 had settled north of the Wisconsin river, being unwilling to cross the Mississippi to their new Iowa reservation from fear of the Sioux. In 1835 about 1,000 Chippewas, Ottawas and”
1908-brown-rock-county/02-ancient-occupants.md, Vol. 1, PDF p. 40 / book p. 32
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