She served in, and supported, several blockades of the Confederate States of America, including the Union Army’s Western Flotilla and the Union Navy’s Mississippi River Mortar Brigade.
Sampson, a screw tug built in 1861 at New Haven, Missouri, was purchased by the Union Army in the fall of 1861 for the use of the Western Flotilla; transferred to the Union Navy 30 September 1862; and placed in service the same day.
Renamed Pansy 24 October 1862 the tug served the Mississippi squadron throughout the Civil War. Operating primarily out of Cairo, Illinois, and Vicksburg, Mississippi, she towed larger ships and acted as a dispatch vessel.
After the war she served as a tug at Mound City, Illinois, until sold there 1 September 1868.