Statistics for occurrence #1 of “Doc” in year 1862, month September, day 20 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

... a body of Union troops under the command of General Sykes, and a numerically much superior force of rebels, resulting in the retreat of the Unionists, who retired in good order across the Potomac.--( Doc . 210.) The United States ram Queen of the West, under the command of Lieutenant-Colonel Lippincott, with two transports laden with troops, while on a reconnoitring expedition on the Mississippi...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Doc 6,842 2,810 2 0 0 user votes
N. Y. Doc 1,108 0 0 0 0 user votes
Y. S. M. Doc 78 0 0 0 0 user votes
London Doc 4 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.