Statistics for occurrence #1 of “William Arthur” in chapter 6 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.:

...omac, and which contained large quantities of war-supplies of all kinds. A more critical examination, however, showed the necessity of In front of the tent at the right of the picture sits William Arthur , brother of Chester A. Arthur, the future President. This view was taken from the Fort down toward the camp. The Fourth New York Heavy Artillery was organized at New York, November, 1861, to Febr...
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William Arthur 15 2 1 0 0 user votes

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