Statistics for occurrence #1 of “Pleasonton” in chapter 1 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:

... distant from railroad or telegraph, all tended to temper and sharpen the blades that were to point the path of glory to thousands destined to ride under the war-guidons of Sheridan, Stuart, Buford, Pleasonton , Fitzhugh Lee, Stanley, Wilson, Merritt, Gregg, and others — all graduates of the service school of the Plains. At the outbreak of the Civil War, the military conditions in the two section...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Alfred Pleasonton 765 52 25 2 0 user votes
A. Pleasonton 137 0 3 0 0 user votes
Pleasonton 102 0 14 0 0 user votes
Gen Pleasonton 2 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.