MAY 18TH, 1861: Commander Dahlgren suggested a plan for the erection of batteries on commanding points along the Potomac, and "the placing of vessels of some force at two or three intervals from the kettle bottoms of the Yard [Washington Navy Yard] near suspected positions, with communications kept up by some fast and light steamers."
MAY 19TH, 1861: USS Monticello, Captain Henry Eagle, and the USS Thomas Freeborn, engaged a Confederate battery at Sewell's Point, Virginia.
** CSS Lady Davis, Lt. Thomas P Pelot, captured American ship A.B. Thompson off Charleston.
There was some question as to whether or not this was a privateer.