Statistics for occurrence #1 of “Duffie” in chapter 10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

...brigade, riding well ahead of his men, in a charge against my battery and the infantry supports; we were so filled with admiration of his bravery that we were reluctant Led by Colonel Alfred Duffie , the dashing cavalryman whose portrait is above, Federal cavalry had its first opportunity to measure itself in a real trial of strength with the hardy horsemen of the South at Kelly's Ford on March ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Alfred Duffie 14 14 2 2 0 user votes
Duffie 152 0 44 0 0 user votes
A. N. Duffie 33 0 3 0 0 user votes
Alfred N. Duffie 11 0 5 0 0 user votes
Mathew M. Duffie 4 0 2 0 0 user votes
M. M. Duffie 2 0 0 0 0 user votes
A. Duffie 1 0 1 0 0 user votes
A. M. Duffie 1 0 1 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.