Statistics for occurrence #1 of “Captain Greenwalt” in chapter 1.7 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.:

...dred and Second New York (judge-advocate); Captain Zarracher, Twenty-ninth Pennsylvania; Captain Fitzpatrick, Twenty-eighth Pennsylvania; Captain Pierson, One Hundred and Thirty-seventh New York, and Captain Greenwalt , One Hundred and Eleventh Pennsylvania. quantity of supplies demanded. It was not difficult to procure guards for the prisoners, the number of medical men and the amount of medical supplies were u...
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