 During these operations, she teamed with to capture the Rebel steamer "Louisville" (later ) on the Little Red River.In the late summer, "Rattler" patrolled the Mississippi River near Rodney, Mississippi, above Natchez, Mississippi, to intercept crossing attempts by Confederate forces, inspect river craft, and convoy supply boats, helping to seal off the South from supplies and manpower west of the mighty river.On 13 September 1863, "Rattler's" commanding officer, Acting Master E. H. Fentress, and 16 crewmen were captured by Rebel guerrillas while attending church at Rodney.