Thomas Williamson was a medical doctor who arrived in Minnesota in 1835. Along with caring for a multitude of Dakota and white patients, he, along with John Renville, Stephen Riggs and Gideon and Samuel Pond, helped create the first written alphabet and grammar of the Dakota language. Thomas Williamson established a mission at Lac qui Parle in 1835.
He was at Pejuhutazizi (Yellow Medicine), his mission near the Upper Agency, when he received word of the war on August 18, 1862. Rather than fleeing immediately he stayed and supported the many Dakota men who, at great risk to their families, chose not to fight. Williamson; his wife, Margaret; and his sister, known as “Aunt Jane” Williamson, were finally convinced to leave on August 20. “Christian Indians had staid by us all night guarding us while we slept and assisting us when awake in every way in their power,” Williamson wrote. Two Christian Dakota men provided the Williamsons with a team of oxen and a wagon to use during their escape: Robert Hopkins Caske, a neighbor; and Simon Anawaƞgmani, who headed a Wahpeton band living near Stephen Riggs’s Hazelwood Mission. Peace Party members Lorenzo Towaƞiteton Lawrence, Little Paul Mazakutemani, Peter Tapataṭaƞka (Big Fire), and Enos Maḣpiyahdinape were also involved in this dangerous enterprise.
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Thomas S. Williamson: An Inventory of His Papers at the Minnesota Historical Society Manuscripts Collection.