Statistics for occurrence #1 of “Lieut. R. M. Maguire” in chapter 1, page 150 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1: prelminary narrative:

...oasted of belonging to Hooker's old brigade in McClellan's army. Besides the colonel, there were Maj. Gardner Walker, Capt. C. M. Jordan, Capt. J. S. Clark, Capt. G. E. Henry, Capt. W. S. Johnston, Lieut. R. M. Maguire , Lieut. Frank Thomas.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.