In the second half of the 1800s, as American settlers intruded on tribal lands, American Indians and U.S. forces fought a number of battles for control of the Great Plains. Some events of this period, however, are more accurately called massacres rather than battles. In the Sand Creek Massacre of 1864, members of the Colorado militia attacked a Cheyenne village and killed between 150 and 500 people. In the Fetterman Massacre of 1866, Sioux warriors killed an entire unit of 80 U.S. soldiers. The conquest of the Indians was completed in 1890 at Wounded Knee in South Dakota, where U.S. troops massacred more than 200 Sioux men, women, and children.