Statistics for occurrence #1 of “Captain Alexander” in chapter 2 of General Joseph E. Johnston, Narrative of Military Operations During the Civil War:

...f their brigades. From their reports it seemed to be as probable that McDowell was forming his main force in front of our main body, as that he was directing it against our left. At nine o'clock, Captain Alexander , of the Engineer Corps, who was also chief signal-officer, reported that large bodies of Federal troops could be seen from one of his signal-stations, crossing the valley of Bull Run, about two miles...
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