Statistics for occurrence #1 of “South Mountain” in chapter 8.66 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...d Ferrero: 21st Mass., Col. William S. Clark; 35th Mass., Col. Edward A. Wild (w), Lieut.-Col. Sumner Carruth (w); 51st N. Y., Col. Robert B. Potter; 51st Pa., Col. John F. Hartranft. Brigade loss: South Mountain , k, 10; w, 83; m, 23 == 116. Antietam, k, 95; w, 368; m, 6 == 469. Artillery: D, Pa., Capt. George W. Durell; E, 4th U. S., Capt. Joseph C. Clark, Jr. Artillery loss: Antietam, k, 2; w, 4 == 6. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
South Mountain (Pennsylvania, United States) 79 2 1 0 0 user votes
South Mountain (Arizona, United States) 0 0 0 0 0 user votes
South Mountain (Arizona, United States) 0 0 0 0 0 user votes
South Mountain (Arizona, United States) 0 0 0 0 0 user votes
South Mountain (Arkansas, United States) 0 0 0 0 0 user votes
South Mountain (Arkansas, United States) 0 0 0 0 0 user votes
South Mountain (Arkansas, United States) 0 0 0 0 0 user votes
South Mountain (California, United States) 0 0 0 0 0 user votes
South Mountain (California, United States) 0 0 0 0 0 user votes
South Mountain (Colorado, United States) 0 0 0 0 0 user votes
South Mountain (Colorado, United States) 0 0 0 0 0 user votes
South Mountain (Connecticut, United States) 0 0 0 0 0 user votes
South Mountain (Idaho, United States) 0 0 0 0 0 user votes
South Mountain (Idaho, United States) 0 0 0 0 0 user votes
South Mountain (Maine, United States) 0 0 0 0 0 user votes
South Mountain (Maine, United States) 0 0 0 0 0 user votes
South Mountain (Maine, United States) 0 0 0 0 0 user votes
South Mountain (Massachusetts, United States) 0 0 0 0 0 user votes
South Mountain (Massachusetts, United States) 0 0 0 0 0 user votes
South Mountain (Massachusetts, United States) 0 0 0 0 0 user votes
South Mountain (New Hampshire, United States) 0 0 0 0 0 user votes
South Mountain (New Hampshire, United States) 0 0 0 0 0 user votes
South Mountain (New Mexico, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (New York, United States) 0 0 0 0 0 user votes
South Mountain (North Carolina, United States) 0 0 0 0 0 user votes
South Mountain (North Carolina, United States) 0 0 0 0 0 user votes
South Mountain (Oregon, United States) 0 0 0 0 0 user votes
South Mountain (Oregon, United States) 0 0 0 0 0 user votes
South Mountain (Pennsylvania, United States) 0 0 0 0 0 user votes
South Mountain (Pennsylvania, United States) 0 0 0 0 0 user votes
South Mountain (Pennsylvania, United States) 0 0 0 0 0 user votes
South Mountain (Texas, United States) 0 0 0 0 0 user votes
South Mountain (Texas, United States) 0 0 0 0 0 user votes
South Mountain (United States) 0 0 0 0 0 user votes
South Mountain (United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Utah, United States) 0 0 0 0 0 user votes
South Mountain (Vermont, United States) 0 0 0 0 0 user votes
South Mountain (Vermont, United States) 0 0 0 0 0 user votes
South Mountain (Washington, United States) 0 0 0 0 0 user votes
South Mountain (Wyoming, 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.