USS Underwriter was a 341-ton sidewheel steamer that was purchased for military use by the Union Navy during the American Civil War.
Confederate troops abandoning USS Underwriter after setting her afire, 2 February 1864
The Potomac Flotilla, also called the Potomac Squadron, was a unit of the United States Navy created in the early days of the American Civil War to secure Union communications in the Chesapeake Bay, the Potomac River and their tributaries, and to disrupt Confederate communications and shipping there.
Attack on the Confederate Batteries at Aquia Creek by the Potomac Flotilla.