Statistics for occurrence #1 of “Colonel Cogswell” in chapter 25, page 412 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...s enhanced by the resignation of Colonel Greene, which took place shortly afterwards. Early in December, however, he received an order from Headquarters to serve as medical director on the staff of Colonel Cogswell , acting Brigadier-General; but in January, 1863, Colonel Tannett, the new commander of the Fourteenth, ordered him to Maryland Heights to look after four companies of the Fourteenth, which were stati...
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