Statistics for occurrence #1 of “Colonel Webster” in chapter 28, page 219 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...keep up my spirits. He had not long to wait before his wishes were fulfilled. On the 16th of January, 1862, he was commissioned Second Lieutenant in the Twelfth Regiment Massachusetts Volunteers, Colonel Webster . His letters from the field began the same month, and in February he was already so pleased with his new profession as to write: I wish to see one fight as a line officer, and I should not desire...
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