Statistics for occurrence #1 of “Captain Costar” in chapter 76 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 7.:

...battalion of the Fourth New-York, under Colonel Cesnola, to charge up the road. There was a little hesitancy at first, when General Kilpatrick, accompanied by Colonel Douty, of the First Maine, and Captain Costar , of General Pleasanton's staff, went to the front, and called upon the troops to follow. There was no hesitancy then. The Maine boys gave three cheers for General Kilpatrick, and the whole column...
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