Statistics for occurrence #1 of “H. P. Powers” in chapter 46 of Admiral David D. Porter, The Naval History of the Civil War.:

...aymaster, E. A. Chadwick; Acting-Master, H. L. Sturgis; Acting-Ensigns, Edward Pendexter and Eugene Biondi; Acting-Master's Mates, Edward Hennessy and Francis Way; Engineers: Acting-Second Assistant, H. P. Powers ; Acting-Third-Assistants, Chas. Haskins, John Dunlap and James Creery. Lieutenant-Commander, Chester Hatfield; Assistant Surgeon, H. W. Birkey; Acting-Assistant Paymaster, W. L. Pynchon; Act...
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