Statistics for occurrence #1 of “Prospect Hill, Virginia” in chapter 1 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

...en to fall victims to some roving body of Confederates who welcomed the opportunity to appropriate superior arms and equipment. The regiment in this photograph is the Thirteenth New York Cavalry at Prospect Hill, Virginia . They are no longer raw troopers but have become the eyes of Washington and its chief protection against the swift-riding Mosby and his men. The troopers were drilled on foot as well as mounted. ...
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