Statistics for occurrence #1 of “Official Records” in chapter 5.64 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 3.:

...., Lieut.-Col. Samuel T. Wells; 27th Iowa, Col. James I. Gilbert; 11. Battery, Capt. Thomas F. Vaughn. At the beginning of the campaign the Union forces aggregated about 12,000 for duty. (See Official Records , Vol. XXII., Pt. I., p. 475.) From Devall's Bluff, Sept. 1, General Steele reported that his force, for duty, was considerably short of 12,000 (ibid, p. 474). According to the return for Sept. 10t...
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