| Jackson's division | 1600 |
| Ewell's division | 3400 |
| D. H. Hill's division | 3000 |
| D. R. Jones' division | 1850 |
| A. P. Hill's division | 1900 |
| Hood's division | 2000 |
| McLaws' division | 2893 |
| R. H. Anderson's division | 3500 |
| J. G. Walker's division | 3200 |
| Geo. T. Anderson's brigade | 300 |
| N. G. Evans' division | 1500 |
| Lee's cavalry brigade | 1500 |
| Artillerists | 1800 |
| Total | 28,443 |
Note:—There is no evidence that Armistead's brigade of R. H. Anderson's division drew trigger in this battle.
| The Confederate casualties in the Maryland campaign as given in the War Records | 13,609 |
| The Federal casualties, including the garrison at Harper's Ferry | 27,767 |
| Deducting the Harper's Ferry garrison, we have the Federal losses of the campaign | 15,203 |
| Deducting Federal losses at Boonsboro Gap of 1813, Crampton's Gap 533, we have approximately as the Federal loss in battle of Sharpsburg | 12,856 |
| Deducting the estimated Confederate loss at Boonsboro Gap, Crampton's Gap and Harper's Ferry, 3948, from the campaign loss, we have approximately as the Confederate loss at Sharpsburg | 9,661 |
The actual number of Union soldiers on the firing line in the battle of Sharpsburg could not have exceeded 68,000 men, but Porter's corps, some 19,000, was close up in the center in reserve, with more than 14,000, only a march away.
The night of the battle several of our men went out on the battlefield, to look after the dead and wounded and for other purposes. Among those from my company who went out in this way were Travis Burton and Lieutenant Stone, who shortly returned with an unwounded prisoner of a Rhode Island regiment, who had failed to get away with his retreating comrades. This prisoner was a mere boy, who exhibited considerable signs of fear and trepidation, and with whom Captain Ashby had quite a little fun.
On passing over a battlefield after the close of the battle, it will usually be observed that the pockets of the dead, and sometimes of the wounded, have been turned out. A soldier will generally take from the battlefield and the dead what he wants.
The next day, the 18th, was in the main quiet, with some little picket firing; the wounded were being cared for and the dead buried. In the immediate front of our brigade, some fifty yards away, the farthest point reached by Harland's Federal brigade the day before, and the ground on which it stood, when charged by the brigades of Toombs and Kemper, I counted the bodies of 33 dead Union soldiers of the 8th Connecticut regiment. One of the wounded was still living, to whom I gave a drink of water and filled his canteen. During the day a man of our regiment, who had gone forward to help remove the Federal wounded, was shot through the body and killed by a Federal sharpshooter, who was so far away that the report from his rifle was not heard by the men engaged in the removal of the wounded.
On the night of the 18th, we left the battle line, moving to the Potomac, wading the river at the ford near Sheperdstown, and instead of singing when crossing the river thirteen days before, "Maryland, MY Maryland!" the song was, "Carry me back, oh! carry me back to old Virginia, once more."
A halt was made some three miles from the river; moving in a day or two to near Bunker Hill, and again to a point nearer to Winchester, close by a large spring, where we received quite a number of accessions to our ranks by the return of the shoeless, sick, and some wounded men left along the route of our advance into Maryland.