Browsing named entities in 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. (ed. Francis Trevelyan Miller). You can also browse the collection for Logan or search for Logan in all documents.

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retired to Saps at Vicksburg. In the center rises Coonskin Tower, a lookout and station for sharpshooters. It was built under the direction of Lieutenant Henry C. Foster of the Twenty-third Indiana Infantry. In honor of his raccoon-fur cap, the soldiers nicknamed him Coonskin. The sap-roller, shown in the illustration below, was used for construction of a sap or trench extending toward the defenders' works in a siege. A famous sap appears in the upper photograph — that built by Logan's busy men, winding its way toward the strong redan of the veteran Third Louisiana Regiment on the Jackson Road. First a parallel is opened — that is, a trench is constructed parallel to the besieged entrenchments. From this are constructed several approaches, or saps, to enable an approach to be made under cover to a position where a second parallel may be. These are built in a zigzag direction, so that the defender cannot enfilade the trench, except when very close to the opposing works,