Officers of the famous "Irish Brigade," which lost more than 41 per cent. of its strength in the first assault at Marye's Heights. The "Irish Brigade" (consisting of the Twenty-eighth Massachusetts, the Sixty-third, Sixty-ninth, and Eighty-eighth New York, and the One Hundred and Sixteenth Pennsylvania) was commanded by General Thomas F. Meagher and advanced in Hancock's division to the first assault on December 13, 1862.
Source:
Miller, Francis T., The Photographic History of the Civil War Volume 2
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