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The Spirit Lake Massacre (March 8–12, 1857) was an attack by a Wahpekute band of Santee Sioux on scattered Iowa frontier settlements during a severe winter. Suffering a shortage of food, the renegade chief Inkpaduta (Scarlet Point) led 14 Sioux against the settlements near Okoboji and Spirit lakes in the northwestern territory of Iowa near the Minnesota border, in revenge of the murder of Inkpaduta's brother, Sidominadotah, and Sidominadotah's family by Henry Lott. The Sioux killed 35-40 settlers in their scattered holdings, took four young women captive, and headed north. The youngest captive, Abbie Gardner, was kept a few months before being ransomed in early summer. It was the last Native American attack on settlers in Iowa, but the events increased tensions between the Sioux and settlers in the Minnesota Territory. Nearly 30 years after the events, in 1885 Gardner-Sharp published her memoir, History of the Spirit Lake Massacre and Captivity of Miss Abbie Gardner, whose popularity led to reprinting several editions. It was one of the last captivity narratives written of European Americans' being held by Native Americans.