Statistics for occurrence #1 of “Captain Dahlgren” in chapter 21 of John G. Nicolay, A Short Life of Abraham Lincoln, condensed from Nicolay and Hayes' Abraham Lincoln: A History:

...sota aground and about to be attacked. There was a quick gathering of officials at the Executive Mansion-Secretaries Stanton, Seward, Welles, Generals McClellan, Meigs, Totten, Commodore Smith, and Captain Dahlgren -and a scene of excitement ensued, unequaled by any other in the President's office during the war. Stanton walked up and down like a caged lion, and eager discussion animated cabinet and military off...
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