In August 1862, Minnesota erupted in unprecedented violence. The Dakota, a people that had been confined to two strips of land along the Minnesota River Valley through a series of treaties, began attacking white settlements in the region. Within days, New Ulm had been almost completely burned down and an American Army outpost had been besieged. Just as quickly as the fighting began, it was over; Lincoln, in the midst of leading the Union through the American Civil War, sent Federal troops into Minnesota to put down the uprising. Retaliation was swift and brutal: women, children, and elderly Dakota were sent to an internment camp below Fort Snelling while almost 400 men were tried by a hasty military tribunal for crimes committed during the war. Ultimately 38 were hanged before the end of 1862 in Mankato. All Dakota would be removed from the state in 1863.