In August 1862 the unrest among eastern
Santee bands came to a climax with open combat against settlers in what would be called
Dakota War of 1862, the
Dakota Conflict or
Sioux Uprising. On August 4, 1862 the Sisseton and Wahpeton bands were able to obtain food and supplies from the Indian agency, but on August 17 the
Mdewakanton and
Wahpekute bands were denied. The US Indian Agent and
Minnesota State Senator
Thomas J. Galbraith refused to distribute supplies without having received payment from the Sioux. At a summit to resolve the matter, Dakota leaders asked trader
Andrew Myrick to back their cause. His answer to them was reportedly insulting. His statement outraged the Dakota people. The day before, August 16, annuity monies arrived at
St. Paul, Minnesota for distribution and were sent to
Fort Ridgely on the 17th, but by then it was too late. Historians note actions by four Dakota
aki-ci-ta (warriors) at a settlement at
Acton,
Meeker County, as the beginning of the conflict. A young
aki-ci-ta reportedly stole eggs from a settler, leading to a confrontation in which five white men were killed. Soon violent conflicts erupted elsewhere around the region. Initially the Dakota had victories at the
Battle of Redwood Ferry, their assault on
New Ulm, and the
Battle of Birch Coulee, as well as minor losses at the
Battle of Fort Ridgely, where the European-Americans incurred high losses but won a victory. Sisseton-Wahpeton bands did not participate in the killing of settler families that defined the early conflicts. A majority of the 4,000 members of the two northern tribes opposed the fighting. A large number of Sisseton and Wahpeton had adopted both subsistence farming and Christianity, and had both moral objections and strong reasons of self-interest for keeping peace with the whites. Dakota
aki-ci-ta laid siege to
Fort Abercrombie for six weeks and disrupted supply lines and shipping from the north and
Canada, as well as couriers heading to
St. Cloud and
Fort Snelling. Large-scale combat ended on September 26, 1862 when six companies of Minnesota militia and an artillery unit attacked Dakota positions at the
Battle of Wood Lake. Three days later, Dakota forces surrendered at
Camp Release, where 269 POWs were released to the troops there led by Col.
Henry Sibley. Small-scale skirmishes continued in the following weeks. Historians estimate total casualties at 800 to more than 1,000 civilians and military, but the exact numbers have never been determined. In the wake of the war, the Dakota were severely punished: a US military court convicted 303 men of war crimes and sentenced them to death. Of the 303, the Army hanged 38 men the day after
Christmas in
Mankato, Minnesota, in the largest mass execution in
United States history. Efforts were undertaken to revoke the treaties, abolish the reservation, and expel remaining Dakota people from Minnesota entirely. Bounties of $25 were put on any Dakota found within the boundaries, with the exception of 208 families of Mdewakanton, who were considered "friendly". Soon after, additional conflicts in what were known as the
Indian Wars broke out to the south and west, ending finally with the
Wounded Knee Massacre in 1890 and the defeat of the Sioux. In 1866, the
War Department, which then supervised the Indian agents and reservations, appointed
Gabriel Renville 1824–1892, chief scout for General Sibley, as head chief of the Sisseton-Wahpeton bands. In 1867 he was appointed Chief for life by members of the Sissetowan band. ==Education==