The Southern Historical Society followed up with this in 1901:
“This letter (Myers) was published in the Southern Historical Society Papers, in March, 1884. About a year thereafter, one Colonel Henry Stone, styling himself ‘Late Brevet-Colonel U. S. Volunteers, A. A. G. Army of the Cumberland,’ realizing the gravity of the statements contained in this letter, and the disgrace these, if uncontradicted, would bring on General Sherman and his army, and especially on the staff, of which he (Colonel Stone) was a member, wrote a letter to the Rev. J. William Jones, D. D., the then editor of the Historical Society Papers, in which he undertook to show that the Myers letter was not written by any officer in General Sherman’s army. (This letter can be found in Vol. 13, S. H. S. Papers, page 439.)
"The reasons assigned by Colonel Stone were plausibly set forth, and Dr. Jones, in his anxiety to do justice even to Sherman’s “bummers,” after publishing Colonel Stone’s letter, said editorially, he was “frank to admit that Colonel Stone seems to have made out his case against the authenticity of this letter.”
"The Myers’ letter was first published on October 29, 1883. On the 31st of July, 1865, Captain E. J. Hale, Jr., of Fayetteville, N. C., who had been on General James H. Lane’s staff, and who is vouched for by General Lane as “an elegant educated gentleman,” wrote to General Lane, telling him of the destruction and devastation at his home, and in that letter he makes this statement:
“You have doubtless heard of Sherman’s ‘bummers.’ The Yankees would have you believe that they were only the straggling pillagers usually found in all armies. Several letters written by officers of Sherman’s army, intercepted near this town, give this the lie.
“In some of these letters were descriptions of the whole bumming process, and from them it appears that it was a regularly organized system, under the authority of General Sherman himself; that one-fifth o£ the proceeds fell to General Sherman, another fifth to the other general officers, another fifth to the line officers, and the remaining two-fifths to the enlisted men.”
“Now, compare this division of the spoils with that set forth in the Myers’ letter, published,...eighteen years later, and it will be seen that they are almost identical, and this statement was taken, as Captain Hale states, from “several letters written by officers of Sherman’s army,” intercepted near Fayetteville, N. C., and...they confirm the statements of the Myers’ letter, and its consequent genuineness, to a remarkable degree.
"It is proper, also, to state, that we have recently received a letter from Dr. Jones, in which he states that after carefully considering this whole matter again, he is now satisfied that he was mistaken in his editorial comments on Colonel Stone’s letter, that he is now satisfied of the genuineness of the Myers’ letter, and that in his opinion we could use it in this report “with perfect propriety and safety.”
As somebody who's read of what the rebs inflicted on the good Unionist people of East Tennessee, Western NC, Northern Alabama and elsewhere, it's hard for me to muster undue sympathy for those in Sherman's path. And as Sherman's actions helped end such abuse, I think he was well justified in his harsh waging of war.