Statistics for occurrence #1 of “Appomattox River” in chapter 13 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.:

... by the loss of a part of the entrenchments before that city, and this necessitated an interior line of defense, pending the withdrawal of the main body of General Lee's army to the north side of the Appomattox River . This new line of breastworks was thrown up hurriedly, in part by the engineer troops, but chiefly by negro laborers. This was probably the only time that the Confederates required negro labo...
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