The Marias Massacre occurred on January 23, 1870, in Montana Territory as part of a broader campaign by the United States Army to suppress Mountain Chief's band of Piegan Blackfeet. The U.S. government had previously promised protection to Chief Heavy Runner's band, yet it was this band—not the targeted group—that became the focus of the military assault. This attack on a protected Native American community represented a significant breach of federal assurances and sparked immediate public outrage.
Major Eugene Mortimer Baker commanded the United States Army forces that carried out the massacre. The operation resulted in the deaths of approximately 200 Piegan Blackfeet people, the majority of whom were women, children, and older men. The targeting of Heavy Runner's band instead of Mountain Chief's intended target underscored the indiscriminate nature of the campaign and its devastating impact on vulnerable populations within the Native American community.
The massacre precipitated a major shift in federal Indian policy. The public outrage generated by the attack prompted a long-term move toward a "Peace Policy" championed by President Ulysses S. Grant. Grant's administration retained the Bureau of Indian Affairs within the Department of the Interior rather than allowing the War Department to regain control. In an effort to reduce corruption and improve relations with Native American peoples, Grant appointed agents recommended by various religious clergy, including Quakers and Methodists, to serve in positions overseeing Indian affairs. This institutional and philosophical reorientation represented a consequential change in how the federal government approached its relationship with Native American tribes.
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, most of whom were women, children, and older men.
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