Statistics for occurrence #1 of “Acting-Master N. M. Dyer” in chapter 46 of Admiral David D. Porter, The Naval History of the Civil War.:

...I am much indebted to the executive officer, H. J. Sleeper, for his cool, prompt, and officer-like conduct; he is a valuable officer. For the efficient handling of the vessel, I am much indebted to Acting-Master N. M. Dyer , who had permission to go North on leave, but volunteered to remain to assist in the attack upon the forts. Acting-Ensign John White was cool and deliberate, working his rifle-gun with good effect....
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