Statistics for occurrence #1 of “McClernand” in page 220 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

... of the Thirteenth Corps, Army of the Tennessee, were constituted the Fifteenth, on December 18, 1862. In two divisions, it was on Sherman's Yazoo Expedition and was also known as the Second Corps, McClernand 's Army of the Mississippi, from January 4 to January 12, 1863. The commanders of the Fifteenth Corps were Major-Generals W. T. Sherman, F. P. Blair, Jr., John A. Logan, Brigadier-General M. L. Smit...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
John Alexander McClernand 40 16 6 2 0 user votes
John A. McClernand 2,049 4 51 0 0 user votes
McClernand 941 0 155 0 0 user votes
J. A. McClernand 348 4 6 0 0 user votes
Jonathan A. McClernand 108 0 0 0 0 user votes
Generals McClernand 20 0 0 0 0 user votes
Geas McClernand 6 0 0 0 0 user votes
Gen McClernand 4 0 0 0 0 user votes
John McClernand 2 0 2 0 0 user votes
Gen John A. McClernand 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.