Statistics for occurrence #1 of “Commander M. B. Woolsey” in chapter 31 of Admiral David D. Porter, The Naval History of the Civil War.:

...nfederate movements he went down the river to attend to affairs personally, and placed the gun-boats where they would do the most good. Unfortunately, there was only one vessel (the Princess Royal, Commander M. B. Woolsey ) stationed at Donaldsonville, the place the enemy was marching to attack, but this officer was equal to the emergency. About noon on the 27th of June, hearing the long roll beaten in the fort whe...
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