Statistics for occurrence #1 of “Butler's Bridge” in chapter 94 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 11.:

...nchments, with a place for one gun. Camp of Seventeenth regiment (eleven hundred strong), near the fort, and the camp of the Fifty-sixth regiment about one mile from Hamilton, from fort, and from Butler's Bridge . At Whitney's Bridge (river road) the bridge is destroyed, road barricaded, and a breastwork one hundred yards above. Five thousand men at Garrysburg; five hundred men at Edwards' Ferry, guardi...
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