The Marias Massacre occurred on January 23, 1870, in Montana Territory as part of the United States Army's broader campaign during the Indian Wars to suppress Mountain Chief's band of Piegan Blackfeet. The U.S. Army, under the command of Major Eugene Mortimer Baker, launched an attack ostensibly targeting Mountain Chief's band. However, the forces instead attacked a different band of Piegan Blackfeet led by Chief Heavy Runner, a leader to whom the United States government had previously promised protection.
The massacre resulted in the deaths of approximately 200 Native people, the majority of whom were women, children, and older men. This attack on a protected band represented a significant breach of the federal government's stated commitments and exposed the vulnerability of Native American groups despite assurances of safety from U.S. authorities.
The massacre provoked substantial public outrage and catalyzed a major shift in federal Indian policy. The incident accelerated the adoption of a "Peace Policy" championed by President Ulysses S. Grant. In response to the crisis and the corruption he identified within the Indian affairs bureaucracy, Grant maintained the Bureau of Indian Affairs within the Department of the Interior rather than allowing the War Department to assume control. Grant subsequently appointed agents recommended by various religious clergy, including Quakers and Methodists, in an effort to reduce corruption and improve the administration of Indian affairs.
The Indian Wars encompass more than three centuries of armed conflict between the United States government, American settlers, and Indigenous nations — from the Powhatan Wars of the 1620s through the final Plains campaigns of the late 19th century. The eastern conflicts — King Philip's War (1675–1676), the Tuscarora War (1711–1715), and the Creek and Seminole Wars — largely ended organized Indigenous resistance east of the Mississippi by the 1840s. On the Great Plains, the Sioux Wars (1854–1890), Red River War (1874–1875), and Nez Perce War (1877) followed the displacement wrought by the transcontinental railroad and the near-extinction of the American bison — an estimated 30 to 60 million animals reduced to fewer than 1,000 by 1890. The Ghost Dance religious movement and the massacre at Wounded Knee (December 29, 1890), in which US cavalry killed approximately 250 Lakota men, women, and children, marked the effective end of armed resistance. The Dawes Act (1887) allotted reservation land to individual families, opening millions of acres to white settlement and reducing Indigenous landholdings by about two-thirds over the following decades.
Approximately 200 Piegan Blackfeet killed, the majority women, children, and older men
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