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Treaty of Traverse des Sioux ceded to the U.S. lands in southwestern portions of the Minnesota Territoryfor $1.665 million in cash and annuities.
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Treaty of Mendota ceded to the U.S. additional lands in southeastern portions of the Minnesota Territory for $1.41 million in cash and annuitities.
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7,000 Dakota move into two reservations bordering the Minnesota River in southwestern Minnesota.
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Dakota cede additional land on the north bank of the Minnesota River.
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Annuity payments are late; Dakota demand future annuity payments be made directly to them, rather than through traders. Traders refuse to sell provisions on credit. Andrew Myrick, spokesman for the traders, says: "So far as I am concerned, if they are hungry, let them eat grass."
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Four Dakota kill four white settlers.
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Bands of Dakota kill 44 Americans in attacks on the Redwood Agency and on federal troops heading for the Agency.
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Minnesota Governor Ramsey names Col. Henry Sibley to command American volunteer forces. Sixteen settlers are killed around New Ulm. Settlers crowd into a small barricaded area of New Ulm.
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About 650 Dakota attack New Ulm. Town is burned; 34 die and 60 are wounded, but the barricaded area holds out.
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2,000 New Ulm refugees head for Mankato, thirty miles away.
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Battle of Birch Coulee, Dakota under Little Crow defeat Col. Sibley's forces.
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U.S. forces defeat Dakota at Battle of Wood Lake.
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Col. Sibley occupies the Dakota reservation and takes 1200 Dakota men, women, and children into custody. Later another 800 Dakota surrender.
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Sibley appoints military commission to "try summarily" Dakota for "murder and other outrages." In all 393 Dakota are tried. 323 are convicted, of whom 303 are sentenced to be hanged.
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President Lincoln orders only 39 of the executions go forward. The execution of one additional condemned man is suspended later.
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The thirty-eight are hanged in Mankato. It is the largest mass execution in American history.
