Statistics for occurrence #1 of “Colonel Alexander” 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.:

...c. The troops left behind fit for duty did not suffice to man the armaments of the forts, of which the Engineer Corps and artillery had constructed a line of about thirty-seven miles in length. Colonel Alexander , of the Corps of Engineers, was the only officer of the corps whose personal attention could be given to these defenses. Two of the officers in the office of the chief engineer were ordered to his ...
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