Statistics for occurrence #1 of “Lieutenant-Colonel William H. Ludlow” in chapter 1.4, page 104 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.:

...er the speedy exchange of prisoners of war or their disposition otherwise absolutely necessary. After exchanges were well under way, General Thomas returned to Washington and a volunteer officer, Lieutenant-Colonel William H. Ludlow , was appointed agent for exchange. General E. A. Hitchcock was appointed commissioner for exchange, with headquarters in Washington. Almost immediately there were difficulties in the applicatio...
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