Statistics for occurrence #1 of “Lieutenant-Commander W. P. McCann” in chapter 46 of Admiral David D. Porter, The Naval History of the Civil War.:

... the Port Royal, Lieutenant-Commander Bancroft Gherardi. Lackawanna, Captain J. B. Marchand, with the Seminole, Commander E. Donaldson. Monongahela, Commander J. H. Strong, with the Kennebec, Lieutenant-Commander W. P. McCann . Ossipee, Commander Wm. E. LeRoy, and the Itasca. Lieutenant-Commander George Brown. Oneida, Commander J. R. M. Mullany, and the Galena, Lieutenant-Commander C. H. Wells. The iron-clads, ...
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