James D. Porter, Confederate Military History, a library of Confederate States Military History: Volume 7.1, Tennessee
Clement Anselm Evans, Ed.

[164] Ohio, and the Second battalion, under command of Lieut.-Col. C: H. Grosvenor, Eighteenth Ohio, and the Twentieth Indiana and Eighteenth Ohio batteries. The assault was received by Cheatham in the forenoon of the 15th, Granbury's brigade having been placed by the corps commander in a lunette with a section of Turner's battery. Lieutenant-Colonel Grosvenor with his brigade assaulted the salient angle of this field work, and claimed in his official report that one of his captains with 100 men gained the interior of the work, but the men of Granbury's brigade, 300 strong, reserved their fire under orders until the assaulting column was in short range. The volley was terrific, and to escape it part of Grosvenor's force doubtless undertook to seek the cover of the ditch in front of the field work and were there killed. No attempt was made to gain the interior of the work; it would have been an impossible undertaking. It was held and defended by a body of trained veterans, who possessed a capacity for successful resistance against five-fold the number reported to have effected the entrance. If it had been possible there would have been no survivors, and there were no Federals killed inside the work. Cheatham's entire line was well intrenched and no impression was made upon it, and no losses sustained by its defenders except from sharpshooters.

Colonel Morgan, commanding the two colored brigades, reported that his line ‘advanced very close to the enemy's line.’ His troops did come forward as if on dress parade. Our men had never before encountered them on the battlefield, and were amazed at their soldierly bearing. There was no cover to conceal the advance, and it was difficult to restrain our men from mounting the works to witness the novel and imposing spectacle. Morgan's line was permitted to advance ‘very close,’ but when a volley was delivered it was a race between the poor, deluded blacks and their officers for a place of safety.