Statistics for occurrence #1 of “Major-General Fremont” in chapter 7, page 172 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.:

... regular army, and major-general of volunteers in March, 1862. He succeeded McClellan at the head of the army of occupation in western Virginia after his victory at Rich Mountain, and held it until Major-General Fremont took charge of the Mountain Department, March 29, 1862. From June 26th until the end of October, Rosecrans was Pope's successor in the Army of the Mississippi and, taking command of the District of...
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