Statistics for occurrence #1 of “River” in page 498 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...nd the 13th Missouri has probably taken that ground. All these points are particularly mentioned in the reports of the battle and have been verified. On the left-hand road where it crosses the River road, three-quarters of a mile from the landing, is the Fourth Division (Hurlbut's), its Third Brigade between the road and the river, and the line of the two other brigades bearing off to the north-...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
river (Kentucky, United States) 186 44 2 0 0 user votes
river (Illinois, United States) 0 0 0 0 0 user votes
river (Indiana, United States) 0 0 0 0 0 user votes
river (Texas, 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.