Statistics for occurrence #1 of “General McClellan” in chapter 8 of William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington:

...issippi fought at Iuka without any corps formation. This lack of proper organization did not last long, and in 1863 the Western armies took the field with corps organizations similar to those which General McClellan had instituted in the Army of the Potomac, and which were retained during the remainder of the war. Cedar Mountain Rappahannock Gainesville Groveton Second Bull Run South Mountain...
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