Statistics for occurrence #1 of “Elizabeth 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.:
...rps of engineers to prepare defenses against the then inevitable invasion of the State.
The moment that the Norfolk Navy-Yard was evacuated, the erection and armament of batteries along the Elizabeth River was begun to prevent its recapture; and thus Virginia came into possession of a thoroughly equipped navy-yard, at which the Merrimac, some time later, was converted into the ironclad Virginia, and th...
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