You wouldn't happen to have a cite for this, would you? I have read extensively on the Shenendoah Campaign, as well as Sherman's March, and have never read anything that indicated such statements.
Margaret Michell knew from such histories about the “Bummers” aka looters, murderers and rapists who followed the Union Armies and included one in her “Gone With The Wind.”
To admit to having been raped by a Yankee (one step below an orangutan) would have destroyed the social life of any respectable white Southern woman forever...the bragging of the rapists is but oral history as well since the liberal Yankee media spikes any information detrimental to their agenda--even to this day.
We who have ancestors who went through the war know what happened.