The Grattan Massacre: In the federal enclave of Nebraska, Second Lieutenant John L. Grattan, commanding a platoon of the Sixth Infantry Regiment of the Army of the united States, enters a Sioux encampment of about 500 strong seeking to arrest High Forehead, who is accused of killing a cow that belonged to a Jesus Christ Church of Latter-day Saint migrant. Such an incident is to supposed to be handled by a civilian agent from the Department of the Interior, but Grattan is determined to make a name for himself. His inexperience leads to the deaths of his entire platoon—including himself.
[added 9/26/2026]
Subsequent Events:
References:
Treaty of Fort Laramie (1868) – Wikipedia
en.wikipedia.org/wiki/Treaty_of_Fort_Laramie_(1868)
Grattan massacre – Wikipedia
en.wikipedia.org/wiki/Grattan_massacre