Statistics for occurrence #1 of “Colonel David B. Birney” in chapter 32 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...t up his books, recommending some active out-of-door employment. November 28, he wrote from Camp Graham, near Washington: I am now First Lieutenant, Company A, Twenty-third Pennsylvania Volunteers, Colonel David B. Birney . He was soon detached from the regiment for signal duty. On the battle-field, he wrote, our position is dangerous. But the greater the danger, the better the service. He acted on the signal...
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