From "The Capture of New Orleans" by Chester G. Hearn.
On April 18, the USS George Mangham, under Acting Master John Collins, Jr., received a shot in her port bow that passed through the galley and lodged in the mortar bed. But, the ship continued to operate its mortar.
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From the ORN: South Atlantic Blockading Squadron. Operation at Bull's Bay February 19, 1865.
The George Mangham took part at at one point the field artillery of the landed forces was under command of John Collins.
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From the U.S. Navy Officers 1798-1900.
JOHN COLLINS
Acting Master 21 December 1861. Honorably discharged 19 September 1865. Evidently he commanded the George Mangham for the duration of the war.
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Evidently, John Collins commanded the USS George Mangham his whole Civil War naval career.
--Old B-Runner