Statistics for occurrence #1 of “Lieutenant-Colonel Buck” in chapter 11 of Historic leaves, volume 4, April, 1905 - January, 1906:

...re again to be tested. The fact that our colonel was then on detached service led me to believe that the Thirteenth Maine was destined to remain on duty in New Orleans for an indefinite period. Lieutenant-Colonel Buck (late captain in our regiment), who had been assigned to the Twentieth Regiment Corps d'afrique, then stationed at Fort Macomb, had, a month or two before, without my knowledge, appointed me captain ...
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