August 19, 1825
A treaty of peace was made at Prairie du Chien settling boundaries between the Winnebagoes and other tribes (the 1879 history gives the date as August 19; the 1908 history gives only the year 1825).
The evidence
“7. On the 19th of August, 1825, at Prairie du Chien, a treaty was made with the Sioux, Chippewas, Sacs and Foxes, Winnebagoes, Ottawas and Pottawattamies, by which the boundary between the two first nations was agreed upon; also between the Chippewas, Winnebagoes and other tribes.”
1879-history-of-rock-county/04-wisconsin-railroads-commerce-health-statistics.md, PDF p. 211 / book p. 216
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
“gned to end hostilities heightened by the War of 1812 in which the two nations were on opposing sides. After the war, the Ho-Chunk and other Midwestern tribes began to fight among themselves, with war parties avenging past wrongs and fighting to secure new hunting territories. To stem the rising tide of intertribal warfare, the United States sponsored a treaty council at Prairie du Chien in 1825 to establish firm boundaries between the tribes. The Ho-Chunk were one of the signatories of the 1825 Prairie du Chien Treaty along with the Ojibwe, the Indians of the Illinois River, the Santee Dakota (also called the Sioux), and the Sauk and Fox. These tribes thus agreed to boundaries created between them. The treaty did not, however, resolve a dispute the Ho-Chunk and Menominee had with three emigrated New York tribes: the Oneida, Stockbridge-Munsee, and Brothertown. This debate had concerned treaties signed several years earlier by the three tribes. In 1821 and 1822, the New York tribes entered into two treaties with the Ho-Chunk and Menominee to purchase part of their land. Later,”
https://www.mpm.edu/index.php/educators/wirp/nations/ho-chunk/treaties-treaty-rights
mpm.edu, https://www.mpm.edu/index.php/educators/wirp/nations/ho-chunk/treaties-treaty-rights
Grade B: Found on an institutional web page
“ng impact and would have had a big impact on the businesses of the American Fur Company, it’s absolutely impossible not to imagine he was not there. And this is an event that – what the treaty does is it’s being convened for a number of different reasons. It’s not a land cession treaty. None of the tribes there, and there’s a huge number of tribes that are gathering at Prairie du Chien in the summer of 1825, they’re not there to cede any land. There’s a longstanding border war between the Sauk and the Ojib – the Dakota just across the river in Minnesota. And this border war has been ongoing and is threatening to bring in all of the neighboring tribes into a broader Indian conflict. And this is bad for business for the American Fur Company. This is problematical for the United States government as well. And so, Lewis Cass, the territorial governor of Michigan territory, Wisconsin is part of the Michigan territory at this point, and William Clark of the Lewis and Clark fame, who is now the Superintendent of Indian Affairs out of St. Louis, convene this mammoth treaty of all the different tribes living on the Upper Mississippi River Valley. So, you have the Dakota. You have the O”
pbswisconsin.org, https://pbswisconsin.org/watch/university-place/the-life-and-times-of-indian-agent-john-kinzie-n9sqdc/
Grade B: Found on an institutional web page