Brown County, Minnesota: History
Brown County was founded in 1855 in the southwest corner of what was Minnesota Territory. It was named for Joseph Renshaw Brown, a member of the Governor's Council of the Territory in 1855. In 1857, Brown County was divided, creating Cottonwood, Jackson, Martin, Murry, Nobles, Pipestone, and Rock counties. Watonwan was broken off in 1860. Redwood was created from a large portion of Brown County in 1862. Redwood was further divided into Lac qui Parle, Lincoln, Lyon and Yellow Medicine Counties in the 1870s.
In 1862, the county's 150-mile northern border was the boundary line of the Upper and Lower Sioux reservations when the 1862 Dakota War broke out. New Ulm, the county seat, came under heavy attack twice by a superior Mdewakanton Dacotah force that was repulsed. Most of the town was torched and most of the population fled to St. Peter and Mankato. The town took many casualties, with the dead buried in the streets. In 1863, when the treaties with the eastern Dacotah were annulled and the two reservations were dissolved, the county border was moved north 10 miles to the Minnesota River.