Later in her career, the barge was exchanged for a picket boat. They carried several smaller vessels, including one picket boat, one barge, and two dinghies. A picket boat is a type of small naval craft. They were later reinforced with a 45-foot picket boat fitted with torpedo dropping gear. She chalked up another enemy ship, a small picket boat, 13 June in the Marianas. They were designed to carry one picket boat, a barge, a launch, and two cutters. The Union's long steam-powered Picket Boat Number One sank the Confederate ironclad "Albemarle" in 1864. The following week, the submarine sank one 500-ton picket boat and damaged another. Later in her career, the picket boat was removed and two barges were added.