In 2003, Minnesota was 10-3, losing to Michigan (10-3), Michigan State (8-5), and Iowa (10-3). It was their first 10 win season since 1905. Little wonder as to why they won 10. They played 5 non-1A schools, one of which was a High School!
In researching this, 1903 really caught my eye. Minnesota beat Macalester (MN) 112-0, Grinnell (IA) 39-0, Lawrence (WI) 46-0, and Beloit (WI) 46-0. Today all of those schools are in the Midwest Conference in Division III. My grandson played for Beloit this year.