Statistics for occurrence #1 of “Washington, D. C.” in chapter 26 of Admiral David D. Porter, The Naval History of the Civil War.:

...r Brown, his account of this affair is inserted. It will show the kind of fighting that took place on the Mississippi, and the desperate character of the foe the Federals had to contend with. Washington, D. C. , May 28, 1863. Sir — At this my earliest opportunity, I respect-fully submit to the department a report of the operations of the U. S. steamer Indianola, while below Vicksburg, Mississippi;...
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