Sarah Wakefield never forgot the blanket.
The 32-year-old wife of a doctor assigned to the Upper Sioux Agency on Minnesota's frontier, Wakefield was nursing her 20-month-old daughter, Lucy, and raising her 4-year-old son, James, when the U.S.-Dakota War erupted along the Minnesota River in August 1862.
Wakefield and her children spent the war's six weeks in Dakota captivity. But unlike other outraged white settlers, the devoutly Christian mother struck a pro-Dakota chord. She insisted her captors had treated her well — saving her from sexual assault and death, while displaying simple acts of kindness like sharing a blanket with her when she was cold.
Wakefield wound up the only one of 100 captive men and women to testify for the Dakota after the war ended. She said a recently widowed Dakota farmer named Chaska had protected and shuttled her and her kids into hiding during the war's most dangerous moments.
She believed that her testimony had saved him — only to learn that Chaska was hanged with 37 other Dakota on Dec. 26, 1862, in Mankato. Apparently he was mistaken for another man also called Chaska.
Only three months before, the chill of autumn had arrived on the war-torn western plains, when Chaska and his mother had lent her their blankets. "Where could you find white people that would do like that? Go without to cover others," Wakefield wrote. "Was this kindness or not, let me ask you?"
Wakefield posed that question in "Six Weeks in the Sioux Tepees," published the year after the war and expanded in 1864. In the preface, she said she didn't "pretend to be a book-writer" and never intended her words to be perused "by the public eye" — she wrote the book for her children.
But 160 years later, her book stands atop the pile of accounts published about the war — a rare woman's voice from a male-dominated era.