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General McClellan states in his official report that he had in this battle, in action, 87,164 men of all arms.

The official reports of the commanding officers of our forces, made at the time, show our total effective infantry to have been 27,255. The estimate made for the cavalry and artillery, which is rather excessive, is 8,000. This would make General Lee's entire strength 35,255.

The official return of the Army of Northern Virginia, on September 22, 1862, after its return to Virginia, and when the stragglers had rejoined their commands, shows present for duty, 36,187 infantry and artillery; the cavalry, of which there is no report, would perhaps increase these figures to 40,000 of all arms.1

The return of the United States Army of the Potomac on September 20, 1862, shows present for duty, at that date, of the commands that participated in the battle of Sharpsburg, 85,930 of all arms.2

The loss of the enemy at Boonsboro and Sharpsburg was 14,794.3

1 Taylor's Four Years with General Lee.

2 Official return from Adjutant General's office, United States Army. ‘Report of Committee on Conduct of the War,’ Part I, p. 492.

3 Ibid., p. 42.

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