Statistics for occurrence #1 of “Surgeon Charles O'Leary” in chapter 1.14 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.:

... The advantages of this organization became speedily manifest, and at the battle of Antietam, in the following month, it gave admirable service. Of its operation in the battle of Fredericksburg, Surgeon Charles O'Leary , medical director of the Sixth Corps, said in his official report: During the engagements of the 13th, the ambulances being guided and governed with perfect control and with a precision rare eve...
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