When the funds finally arrived in Minnesota, it was already too late. On 18thAugust, 1862, Little Crow, chief of the Mdewakanton Dakota Sioux, led a large party of braves in an attack on the Lower Sioux Agency, a settlement populated by Andrew Myrick ,the Indian agent, and various other government officials. The braves killed ten people including Myrick, into whose mouth they stuffed grass as revenge for his response to their earlier request for assistance: ‘Let them eat grass.’
The day before the attack, four Dakota braves killed five european settlers and stole food from them. The likelihood of violent reprisal against the Dakota persuaded Little Crow of the necessity of waging war on the settlers to drive them from the Minnesota River valley. The Dakota made further attacks until they suffered an overwhelming defeat at the Battle of Wood Lake in September, 1862.
Following their surrender, many of the Sioux faced a military tribunal without explanation of what was happening. With some trials lasting less than five minutes, 303 Sioux received a death sentence, although President Lincoln later commuted the majority of these. The US government forced the remaining Dakota Sioux from the Minnesota Valley to reservations in South Dakota.