Statistics for occurrence #1 of “Colonel Ludlow” in chapter 1.4 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

...cretary Stanton, December 28, 1862, answered by suspending the exchange of commissioned officers, but the exchange of enlisted men went on as usual, though marked by much mutual recrimination between Colonel Ludlow and Colonel Ould. Special exchanges were sometimes effected, although Colonel Ould attempted to prevent all such. President Davis' proclamation was practically endorsed by the Confederate Congres...
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