Statistics for occurrence #1 of “First Lieut. O. H. Ernst” in chapter 10, page 128 of The Atlanta (Georgia) Campaign: May 1 - September 8, 1864., Part I: General Report.:

...rly in July the following officers of the Corps of Engineers, who had just graduated at West Point, reported to me, and were assigned to duty as follows: Capt. J. W. Barlow, to Army of the Tennessee; First Lieut. O. H. Ernst , to Army of the Tennessee; First Lieut. William Ludlow, to Army of the Cumberland; First Lieut. A. N. Damrell, to Army of the Ohio. In the Army of the Cumberland each corps, division, and nearly...
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