Statistics for occurrence #1 of “Captain L. L. Langdon” in chapter 2.11 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

... the other two dressing on it. Colonels W. B. Barton's and James Montgomery's brigades followed in the same order of march. Captain John Hamilton's Light Battery E, 3d United States Artillery, and Captain L. L. Langdon 's M, 1st United States Artillery, and a section of Rhode Island Artillery, under Lieutenant Metcalf, followed. One regiment, the 55th Massachusetts, was left in camp, which, with other regiments d...
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