Statistics for occurrence #1 of “J. M. Chadwick” in chapter 56 of Admiral David D. Porter, The Naval History of the Civil War.:

...oks and Jerome Haas. Acting-Volunteer-Lieutenant, C. A. Boutelle; Acting-Assistant Surgeon, W. G. Frost; Acting-Assistant Paymaster, H. S. Gregory; Acting-Master, J. F. Beyer; Acting-Ensign, J. M. Chadwick ; Acting-Master's Mate, J. H. Mallon; Engineers: Acting-First-Assistant, Wm. Doyle; Acting-Second-Assistant, Bernard Martin; Acting-Third-Assistants, R. G. Watson and Henry James. Acting-Volu...
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