Thanks to a 149-year-old "tin box" time capsule and a 10-month-old master's thesis, we now know about a short-lived, secret society in Mankato that was bent on banishing a peaceful tribe of American Indians in 1863.
Made up of Mankato civic leaders, the "Knights of the Forest" pledged "to use every exertion and influence" to remove the Ho-Chunk people — also known as Winnebagos — from 200,000 acres along the Blue Earth River. Never mind that the Ho-Chunk stayed out of the U.S.-Dakota War in 1862. There were profits to be amassed from their prime reservation land south of Mankato.
Planting time capsules in cornerstones of new public buildings, amid festive ceremonies, was common in 1869. More than 1,000 people showed up that June 22 as a procession paraded down Mankato's main street to the then-new Old Main building at Mankato Normal School — today known as Minnesota State University, Mankato.
The capsule's contents, including business cards and newspapers, were read aloud before a musical performance. That capsule was only opened twice in the century that followed: after a 1922 fire and in 1968 during the school's centennial celebration.
But in 2004, a long-buried Knights of the Forest document was unearthed when the capsule's contents were first listed online. It included a membership oath and initiation rites aimed at bringing men "together as brothers" determined "to banish forever from our beautiful State every Indian who now desecrates our soil."
In her May 2017 master's of public history thesis, St. Cloud State librarian Catherine Coats says: "Compelling evidence of Minnesota's unexamined history of hate was locked away in that time capsule along with the ritual document that day" in 1869.
"The Ho-Chunk people were innocent victims of Mankato profiteers' prosperity," Coats said. "Some Knights of the Forest members lived comfortably in Mankato as lawyers, businessmen, and civic leaders for the rest of their lives. Years later, members would sometimes recognize each other via the group's secret grips, passwords, and hand signs."
While the Knights' oath called for ridding the state of all its indigenous people, Coats explains how the Mankato secret society zeroed in on the Ho-Chunk.