Statistics for occurrence #1 of “Groton” in chapter 1, page 18 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1: prelminary narrative:

...ting on Jan. 21, 1861, at the suggestion of Gen. B. F. Butler, and offered its services to the government. As gathered, the regiment included four companies from Lowell, two from Lawrence, one from Groton , one from Acton and one from Worcester. In Boston, which was reached at 1 P. M., there were added a Boston company and a Stoneham company, making eleven in all, or about seven hundred men. These me...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Groton (Massachusetts, United States) 461 2 23 0 0 user votes
Groton (Connecticut, United States) 25 0 11 0 0 user votes
Groton (New York, United States) 7 0 3 0 0 user votes
Groton (New Hampshire, United States) 0 0 0 0 0 user votes
Groton (Ohio, United States) 0 0 0 0 0 user votes
Groton (Ohio, United States) 0 0 0 0 0 user votes
Groton (South Dakota, United States) 0 0 0 0 0 user votes
Groton (Vermont, United States) 0 0 0 0 0 user votes

† 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.