The Battle of Birch Coulee occurred September 2–3, 1862 and resulted in the heaviest casualties suffered by U.S. forces during the Dakota War of 1862. The battle occurred after a group of Dakota warriors followed a U.S. burial expedition, including volunteer infantry, mounted guards and civilians, to an exposed plain where they were setting up camp. That night, 200 Dakota soldiers surrounded the camp and ambushed the Birch Coulee campsite in the early morning, commencing a siege that lasted for over 30 hours, until the arrival of reinforcements and artillery led by Colonel Henry Hastings Sibley.

The Dakota War of 1862, also known as the Sioux Uprising, the Dakota Uprising, the Sioux Outbreak of 1862, the Dakota Conflict, or Little Crow's War, was an armed conflict between the United States and several eastern bands of Dakota collectively known as the Santee Sioux. It began on August 18, 1862, when the Dakota, who were facing starvation and displacement, attacked white settlements at the Lower Sioux Agency along the Minnesota River valley in southwest Minnesota. The war lasted for five weeks and resulted in the deaths of hundreds of settlers and the displacement of thousands more. In the aftermath, the Dakota people were exiled from their homelands, forcibly sent to reservations in the Dakotas and Nebraska, and the State of Minnesota confiscated and sold all their remaining land in the state. The war also ended with the largest mass execution in United States history with the hanging of 38 Dakota men.