Statistics for occurrence #1 of “Little Missouri River” in chapter 21 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...it of Indians to the Bad Lands July 19-28. Battle of Tah kah a kuty or Killdeer Mountain July 28. Passage of the Bad Lands of Dakota Territory August 3-18. Action at Two Hills, Bad Lands, Little Missouri River , August 8-9. Relief of Fiske's Emigrant train September 10-30. At Fort Ridgley, Minn., till spring of 1865. Sully's operations against Indians May to October, 1865. Patrol duty from S...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Little Missouri River (Wyoming, United States) 19 14 1 0 0 user votes
Little Missouri River (Arkansas, United States) 46 22 0 0 0 user votes
Little Missouri river (United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.