Statistics for occurrence #1 of “Northern Virginia” in chapter 4, page 35 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...int of Rocks, Maryland, from a company formed for the Sixty-third Pennsylvania and surplus men of the Twenty-eighth Pennsylvania Infantry in September, 1861. Its service included Pope's campaign in Northern Virginia , beside the Maryland campaign which culminated at Antietam. Its next important campaign was that of Chancellorsville, and then came the Gettysburg campaign. The scene of its activities was then t...
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