Battle of Fort Kearny (Fetterman Fight) 21 December 1866 - United States vs Cheyenne & Sioux
was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1866th year of the Common Era (CE) and Anno Domini (AD) designations, the 866th year of the 2nd millennium, the 66th year of the 19th century, and the 7th year of the 1860s decade. As of the start of 1866, the Gregorian calendar was
12 days ahead of the Julian calendar, which remained in localized use until 1923.
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