Statistics for occurrence #1 of “General Barnard” in chapter 12 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.:

...he low, swampy lands through which the river runs. A third structure, of combined cribwork and trestle, was then constructed, some distance below the two pontoon bridges. Of this last passageway, General Barnard , chief engineer of the Army of the Potomac, remarked that it was an excellent structure, capable of bearing all arms and affording direct communication, in place of that by the inconvenient roads acr...
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