The Battle of Slim Buttes was fought on September 9 and 10, 1876, in the Great Sioux Reservation in the Dakota Territory, between the United States Army and the Sioux. The Battle of Slim Buttes was the first U.S. Army victory of the Great Sioux War of 1876 after George Armstrong Custer's defeat at the Battle of Little Bighorn on June 25 and 26, 1876. Brigadier General George Crook, one of the U.S. Army’s ablest Indian fighters, led the "Horsemeat March," one of the most grueling military expeditions in U.S. history, destroying Oglala Chief American Horse’s village at Slim Buttes and repelling a counter-attack by Crazy Horse.